Merge remote-tracking branch 'origin/main' into problame/batching-sidecar-task

switch back to serial mode by default
spsc_fold: fix missing wakeup on receiver or sender drop while other side is waiting
2026-02-05 03:30:36 +00:00 · 2024-11-30 00:03:30 +01:00 · 2024-11-29 20:55:22 +01:00 · 2024-11-29 20:54:28 +01:00 · 2024-11-29 20:40:51 +01:00 · 2024-11-29 17:42:50 +01:00
222 changed files with 3637 additions and 9097 deletions
--- a/.github/actions/allure-report-generate/action.yml
+++ b/.github/actions/allure-report-generate/action.yml
@@ -43,8 +43,7 @@ runs:
        PR_NUMBER=$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH" || true)
        if [ "${PR_NUMBER}" != "null" ]; then
          BRANCH_OR_PR=pr-${PR_NUMBER}
-        elif [ "${GITHUB_REF_NAME}" = "main" ] || [ "${GITHUB_REF_NAME}" = "release" ] || \
-             [ "${GITHUB_REF_NAME}" = "release-proxy" ] || [ "${GITHUB_REF_NAME}" = "release-compute" ]; then
+        elif [ "${GITHUB_REF_NAME}" = "main" ] || [ "${GITHUB_REF_NAME}" = "release" ] || [ "${GITHUB_REF_NAME}" = "release-proxy" ]; then
          # Shortcut for special branches
          BRANCH_OR_PR=${GITHUB_REF_NAME}
        else
--- a/.github/actions/allure-report-store/action.yml
+++ b/.github/actions/allure-report-store/action.yml
@@ -23,8 +23,7 @@ runs:
        PR_NUMBER=$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH" || true)
        if [ "${PR_NUMBER}" != "null" ]; then
          BRANCH_OR_PR=pr-${PR_NUMBER}
-        elif [ "${GITHUB_REF_NAME}" = "main" ] || [ "${GITHUB_REF_NAME}" = "release" ] || \
-             [ "${GITHUB_REF_NAME}" = "release-proxy" ] || [ "${GITHUB_REF_NAME}" = "release-compute" ]; then
+        elif [ "${GITHUB_REF_NAME}" = "main" ] || [ "${GITHUB_REF_NAME}" = "release" ] || [ "${GITHUB_REF_NAME}" = "release-proxy" ]; then
          # Shortcut for special branches
          BRANCH_OR_PR=${GITHUB_REF_NAME}
        else
--- a/.github/workflows/_create-release-pr.yml
+++ b/.github/workflows/_create-release-pr.yml
@@ -21,7 +21,7 @@ defaults:
    shell: bash -euo pipefail {0}

 jobs:
-  create-release-branch:
+  create-storage-release-branch:
    runs-on: ubuntu-22.04

    permissions:
--- a/.github/workflows/benchmarking.yml
+++ b/.github/workflows/benchmarking.yml
@@ -249,7 +249,7 @@ jobs:

    # Post both success and failure to the Slack channel
    - name: Post to a Slack channel
-      if: ${{ github.event.schedule && !cancelled() }}
+      if: ${{ github.event.schedule }}
      uses: slackapi/slack-github-action@v1
      with:
        channel-id: "C06T9AMNDQQ" # on-call-compute-staging-stream
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -6,7 +6,6 @@ on:
      - main
      - release
      - release-proxy
-      - release-compute
  pull_request:

 defaults:
@@ -71,10 +70,8 @@ jobs:
            echo "tag=release-$(git rev-list --count HEAD)" >> $GITHUB_OUTPUT
          elif [[ "$GITHUB_REF_NAME" == "release-proxy" ]]; then
            echo "tag=release-proxy-$(git rev-list --count HEAD)" >> $GITHUB_OUTPUT
-          elif [[ "$GITHUB_REF_NAME" == "release-compute" ]]; then
-            echo "tag=release-compute-$(git rev-list --count HEAD)" >> $GITHUB_OUTPUT
          else
-            echo "GITHUB_REF_NAME (value '$GITHUB_REF_NAME') is not set to either 'main' or 'release', 'release-proxy', 'release-compute'"
+            echo "GITHUB_REF_NAME (value '$GITHUB_REF_NAME') is not set to either 'main' or 'release'"
            echo "tag=$GITHUB_RUN_ID" >> $GITHUB_OUTPUT
          fi
        shell: bash
@@ -516,7 +513,7 @@ jobs:
            })

  trigger-e2e-tests:
-    if: ${{ !github.event.pull_request.draft || contains( github.event.pull_request.labels.*.name, 'run-e2e-tests-in-draft') || github.ref_name == 'main' || github.ref_name == 'release' || github.ref_name == 'release-proxy' || github.ref_name == 'release-compute' }}
+    if: ${{ !github.event.pull_request.draft || contains( github.event.pull_request.labels.*.name, 'run-e2e-tests-in-draft') || github.ref_name == 'main' || github.ref_name == 'release' || github.ref_name == 'release-proxy' }}
    needs: [ check-permissions, promote-images, tag ]
    uses: ./.github/workflows/trigger-e2e-tests.yml
    secrets: inherit
@@ -672,7 +669,7 @@ jobs:
            neondatabase/compute-node-${{ matrix.version.pg }}:${{ needs.tag.outputs.build-tag }}-${{ matrix.version.debian }}-${{ matrix.arch }}

      - name: Build neon extensions test image
-        if: matrix.version.pg >= 'v16'
+        if: matrix.version.pg == 'v16'
        uses: docker/build-push-action@v6
        with:
          context: .
@@ -687,7 +684,8 @@ jobs:
          pull: true
          file: compute/compute-node.Dockerfile
          target: neon-pg-ext-test
-          cache-from: type=registry,ref=cache.neon.build/compute-node-${{ matrix.version.pg }}:cache-${{ matrix.version.debian }}-${{ matrix.arch }}
+          cache-from: type=registry,ref=cache.neon.build/neon-test-extensions-${{ matrix.version.pg }}:cache-${{ matrix.version.debian }}-${{ matrix.arch }}
+          cache-to: ${{ github.ref_name == 'main' && format('type=registry,ref=cache.neon.build/neon-test-extensions-{0}:cache-{1}-{2},mode=max', matrix.version.pg, matrix.version.debian, matrix.arch) || '' }}
          tags: |
            neondatabase/neon-test-extensions-${{ matrix.version.pg }}:${{needs.tag.outputs.build-tag}}-${{ matrix.version.debian }}-${{ matrix.arch }}

@@ -710,7 +708,7 @@ jobs:
          push: true
          pull: true
          file: compute/compute-node.Dockerfile
-          cache-from: type=registry,ref=cache.neon.build/compute-node-${{ matrix.version.pg }}:cache-${{ matrix.version.debian }}-${{ matrix.arch }}
+          cache-from: type=registry,ref=cache.neon.build/neon-test-extensions-${{ matrix.version.pg }}:cache-${{ matrix.version.debian }}-${{ matrix.arch }}
          cache-to: ${{ github.ref_name == 'main' && format('type=registry,ref=cache.neon.build/compute-tools-{0}:cache-{1}-{2},mode=max', matrix.version.pg, matrix.version.debian, matrix.arch) || '' }}
          tags: |
            neondatabase/compute-tools:${{ needs.tag.outputs.build-tag }}-${{ matrix.version.debian }}-${{ matrix.arch }}
@@ -746,7 +744,7 @@ jobs:
                                             neondatabase/compute-node-${{ matrix.version.pg }}:${{ needs.tag.outputs.build-tag }}-${{ matrix.version.debian }}-arm64

      - name: Create multi-arch neon-test-extensions image
-        if: matrix.version.pg >= 'v16'
+        if: matrix.version.pg == 'v16'
        run: |
          docker buildx imagetools create -t neondatabase/neon-test-extensions-${{ matrix.version.pg }}:${{ needs.tag.outputs.build-tag }} \
                                          -t neondatabase/neon-test-extensions-${{ matrix.version.pg }}:${{ needs.tag.outputs.build-tag }}-${{ matrix.version.debian }} \
@@ -835,7 +833,6 @@ jobs:
      fail-fast: false
      matrix:
        arch: [ x64, arm64 ]
-        pg_version: [v16, v17]

    runs-on: ${{ fromJson(format('["self-hosted", "{0}"]', matrix.arch == 'arm64' && 'small-arm64' || 'small')) }}

@@ -874,10 +871,7 @@ jobs:

      - name: Verify docker-compose example and test extensions
        timeout-minutes: 20
-        env:
-          TAG: ${{needs.tag.outputs.build-tag}}
-          TEST_VERSION_ONLY: ${{ matrix.pg_version }}
-        run: ./docker-compose/docker_compose_test.sh
+        run: env TAG=${{needs.tag.outputs.build-tag}} ./docker-compose/docker_compose_test.sh

      - name: Print logs and clean up
        if: always()
@@ -937,7 +931,7 @@ jobs:
                                              neondatabase/neon-test-extensions-v16:${{ needs.tag.outputs.build-tag }}

      - name: Configure AWS-prod credentials
-        if: github.ref_name == 'release'|| github.ref_name == 'release-proxy' || github.ref_name == 'release-compute'
+        if: github.ref_name == 'release'|| github.ref_name == 'release-proxy'
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-region: eu-central-1
@@ -946,12 +940,12 @@ jobs:

      - name: Login to prod ECR
        uses: docker/login-action@v3
-        if: github.ref_name == 'release'|| github.ref_name == 'release-proxy' || github.ref_name == 'release-compute'
+        if: github.ref_name == 'release'|| github.ref_name == 'release-proxy'
        with:
          registry: 093970136003.dkr.ecr.eu-central-1.amazonaws.com

      - name: Copy all images to prod ECR
-        if: github.ref_name == 'release' || github.ref_name == 'release-proxy' || github.ref_name == 'release-compute'
+        if: github.ref_name == 'release'|| github.ref_name == 'release-proxy'
        run: |
          for image in neon compute-tools {vm-,}compute-node-{v14,v15,v16,v17}; do
            docker buildx imagetools create -t 093970136003.dkr.ecr.eu-central-1.amazonaws.com/${image}:${{ needs.tag.outputs.build-tag }} \
@@ -971,7 +965,7 @@ jobs:
      tenant_id: ${{ vars.AZURE_TENANT_ID }}

  push-to-acr-prod:
-    if: github.ref_name == 'release' || github.ref_name == 'release-proxy' || github.ref_name == 'release-compute'
+    if: github.ref_name == 'release'|| github.ref_name == 'release-proxy'
    needs: [ tag, promote-images ]
    uses: ./.github/workflows/_push-to-acr.yml
    with:
@@ -1059,7 +1053,7 @@ jobs:
  deploy:
    needs: [ check-permissions, promote-images, tag, build-and-test-locally, trigger-custom-extensions-build-and-wait, push-to-acr-dev, push-to-acr-prod ]
    # `!failure() && !cancelled()` is required because the workflow depends on the job that can be skipped: `push-to-acr-dev` and `push-to-acr-prod`
-    if: (github.ref_name == 'main' || github.ref_name == 'release' || github.ref_name == 'release-proxy' || github.ref_name == 'release-compute') && !failure() && !cancelled()
+    if: (github.ref_name == 'main' || github.ref_name == 'release' || github.ref_name == 'release-proxy') && !failure() && !cancelled()

    runs-on: [ self-hosted, small ]
    container: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/ansible:latest
@@ -1108,15 +1102,13 @@ jobs:
              -f deployProxyAuthBroker=true \
              -f branch=main \
              -f dockerTag=${{needs.tag.outputs.build-tag}}
-          elif [[ "$GITHUB_REF_NAME" == "release-compute" ]]; then
-            gh workflow --repo neondatabase/infra run deploy-compute-dev.yml --ref main -f dockerTag=${{needs.tag.outputs.build-tag}}
          else
-            echo "GITHUB_REF_NAME (value '$GITHUB_REF_NAME') is not set to either 'main', 'release', 'release-proxy' or 'release-compute'"
+            echo "GITHUB_REF_NAME (value '$GITHUB_REF_NAME') is not set to either 'main' or 'release'"
            exit 1
          fi

      - name: Create git tag
-        if: github.ref_name == 'release' || github.ref_name == 'release-proxy' || github.ref_name == 'release-compute'
+        if: github.ref_name == 'release' || github.ref_name == 'release-proxy'
        uses: actions/github-script@v7
        with:
          # Retry script for 5XX server errors: https://github.com/actions/github-script#retries
--- a/.github/workflows/ingest_benchmark.yml
+++ b/.github/workflows/ingest_benchmark.yml
@@ -26,7 +26,6 @@ concurrency:
 jobs:
  ingest:
    strategy:
-      fail-fast: false # allow other variants to continue even if one fails
      matrix:
        target_project: [new_empty_project, large_existing_project]  
    permissions:
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -15,10 +15,6 @@ on:
        type: boolean
        description: 'Create Proxy release PR'
        required: false
-      create-compute-release-branch:
-        type: boolean
-        description: 'Create Compute release PR'
-        required: false

 # No permission for GITHUB_TOKEN by default; the **minimal required** set of permissions should be granted in each job.
 permissions: {}
@@ -29,20 +25,20 @@ defaults:

 jobs:
  create-storage-release-branch:
-    if: ${{ github.event.schedule == '0 6 * * MON' || inputs.create-storage-release-branch }}
+    if: ${{ github.event.schedule == '0 6 * * MON' || format('{0}', inputs.create-storage-release-branch) == 'true' }}

    permissions:
      contents: write

    uses: ./.github/workflows/_create-release-pr.yml
    with:
-      component-name: 'Storage'
+      component-name: 'Storage & Compute'
      release-branch: 'release'
    secrets:
      ci-access-token: ${{ secrets.CI_ACCESS_TOKEN }}

  create-proxy-release-branch:
-    if: ${{ github.event.schedule == '0 6 * * THU' || inputs.create-proxy-release-branch }}
+    if: ${{ github.event.schedule == '0 6 * * THU' || format('{0}', inputs.create-proxy-release-branch) == 'true' }}

    permissions:
      contents: write
@@ -53,16 +49,3 @@ jobs:
      release-branch: 'release-proxy'
    secrets:
      ci-access-token: ${{ secrets.CI_ACCESS_TOKEN }}
-
-  create-compute-release-branch:
-    if: inputs.create-compute-release-branch
-
-    permissions:
-      contents: write
-
-    uses: ./.github/workflows/_create-release-pr.yml
-    with:
-      component-name: 'Compute'
-      release-branch: 'release-compute'
-    secrets:
-      ci-access-token: ${{ secrets.CI_ACCESS_TOKEN }}
--- a/.github/workflows/trigger-e2e-tests.yml
+++ b/.github/workflows/trigger-e2e-tests.yml
@@ -51,8 +51,6 @@ jobs:
            echo "tag=release-$(git rev-list --count HEAD)" | tee -a $GITHUB_OUTPUT
          elif [[ "$GITHUB_REF_NAME" == "release-proxy" ]]; then
            echo "tag=release-proxy-$(git rev-list --count HEAD)" >> $GITHUB_OUTPUT
-          elif [[ "$GITHUB_REF_NAME" == "release-compute" ]]; then
-            echo "tag=release-compute-$(git rev-list --count HEAD)" >> $GITHUB_OUTPUT
          else
            echo "GITHUB_REF_NAME (value '$GITHUB_REF_NAME') is not set to either 'main' or 'release'"
            BUILD_AND_TEST_RUN_ID=$(gh run list -b $CURRENT_BRANCH -c $CURRENT_SHA -w 'Build and Test' -L 1 --json databaseId --jq '.[].databaseId')
--- a/1
+++ b/1
@@ -2,7 +2,6 @@
 /compute_tools/ @neondatabase/control-plane @neondatabase/compute
 /libs/pageserver_api/ @neondatabase/storage
 /libs/postgres_ffi/ @neondatabase/compute @neondatabase/storage
-/libs/proxy/ @neondatabase/proxy
 /libs/remote_storage/ @neondatabase/storage
 /libs/safekeeper_api/ @neondatabase/storage
 /libs/vm_monitor/ @neondatabase/autoscaling
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -84,16 +84,16 @@ checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"

 [[package]]
 name = "anstream"
-version = "0.6.15"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64e15c1ab1f89faffbf04a634d5e1962e9074f2741eef6d97f3c4e322426d526"
+checksum = "0ca84f3628370c59db74ee214b3263d58f9aadd9b4fe7e711fd87dc452b7f163"
 dependencies = [
 "anstyle",
 "anstyle-parse",
 "anstyle-query",
 "anstyle-wincon",
 "colorchoice",
- "is_terminal_polyfill",
+ "is-terminal",
 "utf8parse",
 ]

@@ -123,12 +123,12 @@ dependencies = [

 [[package]]
 name = "anstyle-wincon"
-version = "3.0.4"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bf74e1b6e971609db8ca7a9ce79fd5768ab6ae46441c572e46cf596f59e57f8"
+checksum = "180abfa45703aebe0093f79badacc01b8fd4ea2e35118747e5811127f926e188"
 dependencies = [
 "anstyle",
- "windows-sys 0.52.0",
+ "windows-sys 0.48.0",
 ]

 [[package]]
@@ -185,7 +185,7 @@ checksum = "965c2d33e53cb6b267e148a4cb0760bc01f4904c1cd4bb4002a085bb016d1490"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 "synstructure",
 ]

@@ -197,7 +197,7 @@ checksum = "7b18050c2cd6fe86c3a76584ef5e0baf286d038cda203eb6223df2cc413565f7"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -256,7 +256,7 @@ checksum = "16e62a023e7c117e27523144c5d2459f4397fcc3cab0085af8e2224f643a0193"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -267,7 +267,7 @@ checksum = "b9ccdd8f2a161be9bd5c023df56f1b2a0bd1d83872ae53b71a84a12c9bf6e842"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -301,7 +301,7 @@ dependencies = [
 "aws-smithy-types",
 "aws-types",
 "bytes",
- "fastrand 2.2.0",
+ "fastrand 2.0.0",
 "hex",
 "http 0.2.9",
 "hyper 0.14.30",
@@ -341,7 +341,7 @@ dependencies = [
 "aws-smithy-types",
 "aws-types",
 "bytes",
- "fastrand 2.2.0",
+ "fastrand 2.0.0",
 "http 0.2.9",
 "http-body 0.4.5",
 "once_cell",
@@ -417,7 +417,7 @@ dependencies = [
 "aws-smithy-xml",
 "aws-types",
 "bytes",
- "fastrand 2.2.0",
+ "fastrand 2.0.0",
 "hex",
 "hmac",
 "http 0.2.9",
@@ -621,7 +621,7 @@ dependencies = [
 "aws-smithy-runtime-api",
 "aws-smithy-types",
 "bytes",
- "fastrand 2.2.0",
+ "fastrand 2.0.0",
 "h2 0.3.26",
 "http 0.2.9",
 "http-body 0.4.5",
@@ -969,7 +969,7 @@ dependencies = [
 "regex",
 "rustc-hash",
 "shlex",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1031,9 +1031,9 @@ checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"

 [[package]]
 name = "bytes"
-version = "1.9.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "325918d6fe32f23b19878fe4b34794ae41fc19ddbe53b10571a4874d44ffd39b"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 dependencies = [
 "serde",
 ]
@@ -1167,43 +1167,45 @@ dependencies = [

 [[package]]
 name = "clap"
-version = "4.5.22"
+version = "4.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69371e34337c4c984bbe322360c2547210bf632eb2814bbe78a6e87a2935bd2b"
+checksum = "93aae7a4192245f70fe75dd9157fc7b4a5bf53e88d30bd4396f7d8f9284d5acc"
 dependencies = [
 "clap_builder",
 "clap_derive",
+ "once_cell",
 ]

 [[package]]
 name = "clap_builder"
-version = "4.5.22"
+version = "4.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e24c1b4099818523236a8ca881d2b45db98dadfb4625cf6608c12069fcbbde1"
+checksum = "4f423e341edefb78c9caba2d9c7f7687d0e72e89df3ce3394554754393ac3990"
 dependencies = [
 "anstream",
 "anstyle",
+ "bitflags 1.3.2",
 "clap_lex",
- "strsim 0.11.1",
+ "strsim",
 ]

 [[package]]
 name = "clap_derive"
-version = "4.5.18"
+version = "4.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ac6a0c7b1a9e9a5186361f67dfa1b88213572f427fb9ab038efb2bd8c582dab"
+checksum = "191d9573962933b4027f932c600cd252ce27a8ad5979418fe78e43c07996f27b"
 dependencies = [
- "heck",
+ "heck 0.4.1",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
 name = "clap_lex"
-version = "0.7.3"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afb84c814227b90d6895e01398aee0d8033c00e7466aca416fb6a8e0eb19d8a7"
+checksum = "2da6da31387c7e4ef160ffab6d5e7f00c42626fe39aea70a7b0f1773f7dd6c1b"

 [[package]]
 name = "colorchoice"
@@ -1612,8 +1614,8 @@ dependencies = [
 "ident_case",
 "proc-macro2",
 "quote",
- "strsim 0.10.0",
- "syn 2.0.90",
+ "strsim",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1624,7 +1626,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
 "darling_core",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1747,7 +1749,7 @@ dependencies = [
 "dsl_auto_type",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1767,7 +1769,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "209c735641a413bc68c4923a9d6ad4bcb3ca306b794edaa7eb0b3228a99ffb25"
 dependencies = [
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1790,7 +1792,7 @@ checksum = "487585f4d0c6655fe74905e2504d8ad6908e4db67f744eb140876906c2f3175d"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1810,10 +1812,10 @@ checksum = "0892a17df262a24294c382f0d5997571006e7a4348b4327557c4ff1cd4a8bccc"
 dependencies = [
 "darling",
 "either",
- "heck",
+ "heck 0.5.0",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1945,7 +1947,7 @@ dependencies = [
 "darling",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -1978,7 +1980,7 @@ checksum = "3bf679796c0322556351f287a51b49e48f7c4986e727b5dd78c972d30e2e16cc"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -2052,9 +2054,9 @@ dependencies = [

 [[package]]
 name = "fastrand"
-version = "2.2.0"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "486f806e73c5707928240ddc295403b1b93c96a02038563881c4a2fd84b81ac4"
+checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"

 [[package]]
 name = "ff"
@@ -2232,7 +2234,7 @@ checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -2335,7 +2337,7 @@ checksum = "53010ccb100b96a67bc32c0175f0ed1426b31b655d562898e57325f81c023ac0"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -2463,6 +2465,12 @@ dependencies = [
 "num-traits",
 ]

+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -2880,12 +2888,6 @@ dependencies = [
 "windows-sys 0.52.0",
 ]

-[[package]]
-name = "is_terminal_polyfill"
-version = "1.70.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -2910,23 +2912,6 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"

-[[package]]
-name = "jemalloc_pprof"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a883828bd6a4b957cd9f618886ff19e5f3ebd34e06ba0e855849e049fef32fb"
-dependencies = [
- "anyhow",
- "libc",
- "mappings",
- "once_cell",
- "pprof_util",
- "tempfile",
- "tikv-jemalloc-ctl",
- "tokio",
- "tracing",
-]
-
 [[package]]
 name = "jobserver"
 version = "0.1.32"
@@ -3037,9 +3022,9 @@ dependencies = [

 [[package]]
 name = "libc"
-version = "0.2.167"
+version = "0.2.150"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09d6582e104315a817dff97f75133544b2e094ee22447d2acf4a74e189ba06fc"
+checksum = "89d92a4743f9a61002fae18374ed11e7973f530cb3a3255fb354818118b2203c"

 [[package]]
 name = "libloading"
@@ -3059,9 +3044,9 @@ checksum = "4ec2a862134d2a7d32d7983ddcdd1c4923530833c9f2ea1a44fc5fa473989058"

 [[package]]
 name = "linux-raw-sys"
-version = "0.4.14"
+version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78b3ae25bc7c8c38cec158d1f2757ee79e9b3740fbc7ccf0e59e4b08d793fa89"
+checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"

 [[package]]
 name = "linux-raw-sys"
@@ -3094,19 +3079,6 @@ dependencies = [
 "hashbrown 0.14.5",
 ]

-[[package]]
-name = "mappings"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce9229c438fbf1c333926e2053c4c091feabbd40a1b590ec62710fea2384af9e"
-dependencies = [
- "anyhow",
- "libc",
- "once_cell",
- "pprof_util",
- "tracing",
-]
-
 [[package]]
 name = "matchers"
 version = "0.1.0"
@@ -3167,10 +3139,10 @@ version = "0.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9e6777fc80a575f9503d908c8b498782a6c3ee88a06cb416dc3941401e43b94"
 dependencies = [
- "heck",
+ "heck 0.5.0",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -3374,7 +3346,6 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05180d69e3da0e530ba2a1dae5110317e49e3b7f3d41be227dc5f92e49ee7af"
 dependencies = [
- "num-bigint",
 "num-complex",
 "num-integer",
 "num-iter",
@@ -3463,7 +3434,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
 dependencies = [
 "autocfg",
- "num-bigint",
 "num-integer",
 "num-traits",
 ]
@@ -3527,9 +3497,9 @@ dependencies = [

 [[package]]
 name = "once_cell"
-version = "1.20.2"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"

 [[package]]
 name = "oorandom"
@@ -3545,9 +3515,9 @@ checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"

 [[package]]
 name = "opentelemetry"
-version = "0.26.0"
+version = "0.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "570074cc999d1a58184080966e5bd3bf3a9a4af650c3b05047c2621e7405cd17"
+checksum = "4c365a63eec4f55b7efeceb724f1336f26a9cf3427b70e59e2cd2a5b947fba96"
 dependencies = [
 "futures-core",
 "futures-sink",
@@ -3559,9 +3529,9 @@ dependencies = [

 [[package]]
 name = "opentelemetry-http"
-version = "0.26.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6351496aeaa49d7c267fb480678d85d1cd30c5edb20b497c48c56f62a8c14b99"
+checksum = "ad31e9de44ee3538fb9d64fe3376c1362f406162434609e79aea2a41a0af78ab"
 dependencies = [
 "async-trait",
 "bytes",
@@ -3572,9 +3542,9 @@ dependencies = [

 [[package]]
 name = "opentelemetry-otlp"
-version = "0.26.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29e1f9c8b032d4f635c730c0efcf731d5e2530ea13fa8bef7939ddc8420696bd"
+checksum = "6b925a602ffb916fb7421276b86756027b37ee708f9dce2dbdcc51739f07e727"
 dependencies = [
 "async-trait",
 "futures-core",
@@ -3590,9 +3560,9 @@ dependencies = [

 [[package]]
 name = "opentelemetry-proto"
-version = "0.26.1"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9d3968ce3aefdcca5c27e3c4ea4391b37547726a70893aab52d3de95d5f8b34"
+checksum = "30ee9f20bff9c984511a02f082dc8ede839e4a9bf15cc2487c8d6fea5ad850d9"
 dependencies = [
 "opentelemetry",
 "opentelemetry_sdk",
@@ -3602,15 +3572,15 @@ dependencies = [

 [[package]]
 name = "opentelemetry-semantic-conventions"
-version = "0.26.0"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db945c1eaea8ac6a9677185357480d215bb6999faa9f691d0c4d4d641eab7a09"
+checksum = "1cefe0543875379e47eb5f1e68ff83f45cc41366a92dfd0d073d513bf68e9a05"

 [[package]]
 name = "opentelemetry_sdk"
-version = "0.26.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2c627d9f4c9cdc1f21a29ee4bfbd6028fcb8bcf2a857b43f3abdf72c9c862f3"
+checksum = "692eac490ec80f24a17828d49b40b60f5aeaccdfe6a503f939713afd22bc28df"
 dependencies = [
 "async-trait",
 "futures-channel",
@@ -3984,7 +3954,7 @@ dependencies = [
 "parquet",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -4086,7 +4056,7 @@ checksum = "39407670928234ebc5e6e580247dd567ad73a3578460c5990f9503df207e8f07"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -4169,7 +4139,7 @@ dependencies = [
 [[package]]
 name = "postgres"
 version = "0.19.4"
-source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#511f998c00148ab7c847bd7e6cfd3a906d0e7473"
+source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#00940fcdb57a8e99e805297b75839e7c4c7b1796"
 dependencies = [
 "bytes",
 "fallible-iterator",
@@ -4182,7 +4152,7 @@ dependencies = [
 [[package]]
 name = "postgres-protocol"
 version = "0.6.4"
-source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#511f998c00148ab7c847bd7e6cfd3a906d0e7473"
+source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#00940fcdb57a8e99e805297b75839e7c4c7b1796"
 dependencies = [
 "base64 0.20.0",
 "byteorder",
@@ -4195,6 +4165,7 @@ dependencies = [
 "rand 0.8.5",
 "sha2",
 "stringprep",
+ "tokio",
 ]

 [[package]]
@@ -4206,6 +4177,7 @@ dependencies = [
 "bytes",
 "fallible-iterator",
 "hmac",
+ "md-5",
 "memchr",
 "rand 0.8.5",
 "sha2",
@@ -4216,7 +4188,7 @@ dependencies = [
 [[package]]
 name = "postgres-types"
 version = "0.2.4"
-source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#511f998c00148ab7c847bd7e6cfd3a906d0e7473"
+source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#00940fcdb57a8e99e805297b75839e7c4c7b1796"
 dependencies = [
 "bytes",
 "fallible-iterator",
@@ -4326,19 +4298,6 @@ dependencies = [
 "thiserror",
 ]

-[[package]]
-name = "pprof_util"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "65c568b3f8c1c37886ae07459b1946249e725c315306b03be5632f84c239f781"
-dependencies = [
- "anyhow",
- "flate2",
- "num",
- "paste",
- "prost",
-]
-
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -4375,7 +4334,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d3928fb5db768cb86f891ff014f0144589297e3c6a1aba6ed7cecfdace270c7"
 dependencies = [
 "proc-macro2",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -4389,9 +4348,9 @@ dependencies = [

 [[package]]
 name = "proc-macro2"
-version = "1.0.92"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37d3544b3f2748c54e147655edb5025752e2303145b5aefb3c3ea2c78b973bb0"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
 "unicode-ident",
 ]
@@ -4455,7 +4414,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c1318b19085f08681016926435853bbf7858f9c082d0999b80550ff5d9abe15"
 dependencies = [
 "bytes",
- "heck",
+ "heck 0.5.0",
 "itertools 0.12.1",
 "log",
 "multimap",
@@ -4465,7 +4424,7 @@ dependencies = [
 "prost",
 "prost-types",
 "regex",
- "syn 2.0.90",
+ "syn 2.0.52",
 "tempfile",
 ]

@@ -4479,7 +4438,7 @@ dependencies = [
 "itertools 0.12.1",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -4542,7 +4501,6 @@ dependencies = [
 "ecdsa 0.16.9",
 "env_logger",
 "fallible-iterator",
- "flate2",
 "framed-websockets",
 "futures",
 "hashbrown 0.14.5",
@@ -4608,7 +4566,6 @@ dependencies = [
 "tikv-jemalloc-ctl",
 "tikv-jemallocator",
 "tokio",
- "tokio-postgres",
 "tokio-postgres2",
 "tokio-rustls 0.26.0",
 "tokio-tungstenite",
@@ -5034,9 +4991,9 @@ dependencies = [

 [[package]]
 name = "reqwest-middleware"
-version = "0.4.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1ccd3b55e711f91a9885a2fa6fbbb2e39db1776420b062efc058c6410f7e5e3"
+checksum = "0209efb52486ad88136190094ee214759ef7507068b27992256ed6610eb71a01"
 dependencies = [
 "anyhow",
 "async-trait",
@@ -5049,12 +5006,13 @@ dependencies = [

 [[package]]
 name = "reqwest-retry"
-version = "0.7.0"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29c73e4195a6bfbcb174b790d9b3407ab90646976c55de58a6515da25d851178"
+checksum = "40f342894422862af74c50e1e9601cf0931accc9c6981e5eb413c46603b616b5"
 dependencies = [
 "anyhow",
 "async-trait",
+ "chrono",
 "futures",
 "getrandom 0.2.11",
 "http 1.1.0",
@@ -5063,7 +5021,6 @@ dependencies = [
 "reqwest 0.12.4",
 "reqwest-middleware",
 "retry-policies",
- "thiserror",
 "tokio",
 "tracing",
 "wasm-timer",
@@ -5071,9 +5028,9 @@ dependencies = [

 [[package]]
 name = "reqwest-tracing"
-version = "0.5.4"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff82cf5730a1311fb9413b0bc2b8e743e0157cd73f010ab4ec374a923873b6a2"
+checksum = "bfdd9bfa64c72233d8dd99ab7883efcdefe9e16d46488ecb9228b71a2e2ceb45"
 dependencies = [
 "anyhow",
 "async-trait",
@@ -5089,10 +5046,12 @@ dependencies = [

 [[package]]
 name = "retry-policies"
-version = "0.4.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5875471e6cab2871bc150ecb8c727db5113c9338cc3354dc5ee3425b6aa40a1c"
+checksum = "493b4243e32d6eedd29f9a398896e35c6943a123b55eec97dcaee98310d25810"
 dependencies = [
+ "anyhow",
+ "chrono",
 "rand 0.8.5",
 ]

@@ -5216,7 +5175,7 @@ dependencies = [
 "regex",
 "relative-path",
 "rustc_version",
- "syn 2.0.90",
+ "syn 2.0.52",
 "unicode-ident",
 ]

@@ -5262,14 +5221,14 @@ dependencies = [

 [[package]]
 name = "rustix"
-version = "0.38.41"
+version = "0.38.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7f649912bc1495e167a6edee79151c84b1bad49748cb4f1f1167f459f6224f6"
+checksum = "72e572a5e8ca657d7366229cdde4bd14c4eb5499a9573d4d366fe1b599daa316"
 dependencies = [
 "bitflags 2.4.1",
 "errno",
 "libc",
- "linux-raw-sys 0.4.14",
+ "linux-raw-sys 0.4.13",
 "windows-sys 0.52.0",
 ]

@@ -5724,7 +5683,7 @@ checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -5806,7 +5765,7 @@ dependencies = [
 "darling",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -6163,12 +6122,6 @@ version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"

-[[package]]
-name = "strsim"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
-
 [[package]]
 name = "strum"
 version = "0.26.3"
@@ -6181,11 +6134,11 @@ version = "0.26.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c6bee85a5a24955dc440386795aa378cd9cf82acd5f764469152d2270e581be"
 dependencies = [
- "heck",
+ "heck 0.5.0",
 "proc-macro2",
 "quote",
 "rustversion",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -6236,9 +6189,9 @@ dependencies = [

 [[package]]
 name = "syn"
-version = "2.0.90"
+version = "2.0.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "919d3b74a5dd0ccd15aeb8f93e7006bd9e14c295087c9896a110f490752bcf31"
+checksum = "b699d15b36d1f02c3e7c69f8ffef53de37aefae075d8488d4ba1a7788d574a07"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -6268,7 +6221,7 @@ checksum = "c8af7666ab7b6390ab78131fb5b0fce11d6b7a6951602017c35fa82800708971"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -6299,13 +6252,13 @@ dependencies = [

 [[package]]
 name = "tempfile"
-version = "3.14.0"
+version = "3.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28cce251fcbc87fac86a866eeb0d6c2d536fc16d06f184bb61aeae11aa4cee0c"
+checksum = "01ce4141aa927a6d1bd34a041795abd0db1cccba5d5f24b009f694bdf3a1f3fa"
 dependencies = [
 "cfg-if",
- "fastrand 2.2.0",
- "once_cell",
+ "fastrand 2.0.0",
+ "redox_syscall 0.4.1",
 "rustix",
 "windows-sys 0.52.0",
 ]
@@ -6346,27 +6299,27 @@ checksum = "78ea17a2dc368aeca6f554343ced1b1e31f76d63683fa8016e5844bd7a5144a1"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
 name = "thiserror"
-version = "1.0.69"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+checksum = "1e45bcbe8ed29775f228095caf2cd67af7a4ccf756ebff23a306bf3e8b47b24b"
 dependencies = [
 "thiserror-impl",
 ]

 [[package]]
 name = "thiserror-impl"
-version = "1.0.69"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+checksum = "a953cb265bef375dae3de6663da4d3804eee9682ea80d8e2542529b73c531c81"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -6540,13 +6493,13 @@ checksum = "5f5ae998a069d4b5aba8ee9dad856af7d520c3699e6159b185c2acd48155d39a"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
 name = "tokio-postgres"
 version = "0.7.7"
-source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#511f998c00148ab7c847bd7e6cfd3a906d0e7473"
+source = "git+https://github.com/neondatabase/rust-postgres.git?branch=neon#00940fcdb57a8e99e805297b75839e7c4c7b1796"
 dependencies = [
 "async-trait",
 "byteorder",
@@ -6765,7 +6718,7 @@ dependencies = [
 "prost-build",
 "prost-types",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -6802,9 +6755,9 @@ checksum = "b6bc1c9ce2b5135ac7f93c72918fc37feb872bdc6a5533a8b85eb4b86bfdae52"

 [[package]]
 name = "tracing"
-version = "0.1.41"
+version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "784e0ac535deb450455cbfa28a6f0df145ea1bb7ae51b821cf5e7927fdcfbdd0"
+checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
 "log",
 "pin-project-lite",
@@ -6825,20 +6778,20 @@ dependencies = [

 [[package]]
 name = "tracing-attributes"
-version = "0.1.28"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "395ae124c09f9e6918a2310af6038fba074bcf474ac352496d5910dd59a2226d"
+checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
 name = "tracing-core"
-version = "0.1.33"
+version = "0.1.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e672c95779cf947c5311f83787af4fa8fffd12fb27e4993211a84bdfd9610f9c"
+checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
 dependencies = [
 "once_cell",
 "valuable",
@@ -6867,9 +6820,9 @@ dependencies = [

 [[package]]
 name = "tracing-opentelemetry"
-version = "0.27.0"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc58af5d3f6c5811462cabb3289aec0093f7338e367e5a33d28c0433b3c7360b"
+checksum = "a9784ed4da7d921bc8df6963f8c80a0e4ce34ba6ba76668acadd3edbd985ff3b"
 dependencies = [
 "js-sys",
 "once_cell",
@@ -6885,9 +6838,9 @@ dependencies = [

 [[package]]
 name = "tracing-serde"
-version = "0.2.0"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "704b1aeb7be0d0a84fc9828cae51dab5970fee5088f83d1dd7ee6f6246fc6ff1"
+checksum = "bc6b213177105856957181934e4920de57730fc69bf42c37ee5bb664d406d9e1"
 dependencies = [
 "serde",
 "tracing-core",
@@ -6895,9 +6848,9 @@ dependencies = [

 [[package]]
 name = "tracing-subscriber"
-version = "0.3.19"
+version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8189decb5ac0fa7bc8b96b7cb9b2701d60d48805aca84a238004d665fcc4008"
+checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
 dependencies = [
 "matchers",
 "once_cell",
@@ -7106,7 +7059,6 @@ dependencies = [
 "hex-literal",
 "humantime",
 "hyper 0.14.30",
- "jemalloc_pprof",
 "jsonwebtoken",
 "metrics",
 "nix 0.27.1",
@@ -7305,7 +7257,7 @@ dependencies = [
 "once_cell",
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 "wasm-bindgen-shared",
 ]

@@ -7339,7 +7291,7 @@ checksum = "e94f17b526d0a461a191c78ea52bbce64071ed5c04c9ffe424dcb38f74171bb7"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 "wasm-bindgen-backend",
 "wasm-bindgen-shared",
 ]
@@ -7693,12 +7645,8 @@ dependencies = [
 "memchr",
 "nix 0.26.4",
 "nom",
- "num",
 "num-bigint",
- "num-complex",
 "num-integer",
- "num-iter",
- "num-rational",
 "num-traits",
 "once_cell",
 "parquet",
@@ -7720,9 +7668,8 @@ dependencies = [
 "smallvec",
 "spki 0.7.3",
 "subtle",
- "syn 2.0.90",
+ "syn 2.0.52",
 "sync_wrapper 0.1.2",
- "tikv-jemalloc-ctl",
 "tikv-jemalloc-sys",
 "time",
 "time-macros",
@@ -7821,7 +7768,7 @@ checksum = "b3c129550b3e6de3fd0ba67ba5c81818f9805e58b8d7fee80a3a59d2c9fc601a"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
@@ -7842,7 +7789,7 @@ checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.90",
+ "syn 2.0.52",
 ]

 [[package]]
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -74,7 +74,7 @@ bindgen = "0.70"
 bit_field = "0.10.2"
 bstr = "1.0"
 byteorder = "1.4"
-bytes = "1.9"
+bytes = "1.0"
 camino = "1.1.6"
 cfg-if = "1.0.0"
 chrono = { version = "0.4", default-features = false, features = ["clock"] }
@@ -115,7 +115,6 @@ indoc = "2"
 ipnet = "2.10.0"
 itertools = "0.10"
 itoa = "1.0.11"
-jemalloc_pprof = "0.6"
 jsonwebtoken = "9"
 lasso = "0.7"
 libc = "0.2"
@@ -128,10 +127,10 @@ notify = "6.0.0"
 num_cpus = "1.15"
 num-traits = "0.2.15"
 once_cell = "1.13"
-opentelemetry = "0.26"
-opentelemetry_sdk = "0.26"
-opentelemetry-otlp = { version = "0.26", default-features=false, features = ["http-proto", "trace", "http", "reqwest-client"] }
-opentelemetry-semantic-conventions = "0.26"
+opentelemetry = "0.24"
+opentelemetry_sdk = "0.24"
+opentelemetry-otlp = { version = "0.17", default-features=false, features = ["http-proto", "trace", "http", "reqwest-client"] }
+opentelemetry-semantic-conventions = "0.16"
 parking_lot = "0.12"
 parquet = { version = "53", default-features = false, features = ["zstd"] }
 parquet_derive = "53"
@@ -145,9 +144,9 @@ rand = "0.8"
 redis = { version = "0.25.2", features = ["tokio-rustls-comp", "keep-alive"] }
 regex = "1.10.2"
 reqwest = { version = "0.12", default-features = false, features = ["rustls-tls"] }
-reqwest-tracing = { version = "0.5", features = ["opentelemetry_0_26"] }
-reqwest-middleware = "0.4"
-reqwest-retry = "0.7"
+reqwest-tracing = { version = "0.5", features = ["opentelemetry_0_24"] }
+reqwest-middleware = "0.3.0"
+reqwest-retry = "0.5"
 routerify = "3"
 rpds = "0.13"
 rustc-hash = "1.1.0"
@@ -176,7 +175,7 @@ sync_wrapper = "0.1.2"
 tar = "0.4"
 test-context = "0.3"
 thiserror = "1.0"
-tikv-jemallocator = { version = "0.6", features = ["profiling", "stats", "unprefixed_malloc_on_supported_platforms"] }
+tikv-jemallocator = { version = "0.6", features = ["stats"] }
 tikv-jemalloc-ctl = { version = "0.6", features = ["stats"] }
 tokio = { version = "1.17", features = ["macros"] }
 tokio-epoll-uring = { git = "https://github.com/neondatabase/tokio-epoll-uring.git" , branch = "main" }
@@ -192,7 +191,7 @@ tonic = {version = "0.12.3", features = ["tls", "tls-roots"]}
 tower-service = "0.3.2"
 tracing = "0.1"
 tracing-error = "0.2"
-tracing-opentelemetry = "0.27"
+tracing-opentelemetry = "0.25"
 tracing-subscriber = { version = "0.3", default-features = false, features = ["smallvec", "fmt", "tracing-log", "std", "env-filter", "json"] }
 try-lock = "0.2.5"
 twox-hash = { version = "1.6.3", default-features = false }
--- a/compute/compute-node.Dockerfile
+++ b/compute/compute-node.Dockerfile
@@ -14,9 +14,6 @@ ARG DEBIAN_FLAVOR=${DEBIAN_VERSION}-slim
 FROM debian:$DEBIAN_FLAVOR AS build-deps
 ARG DEBIAN_VERSION

-# Use strict mode for bash to catch errors early
-SHELL ["/bin/bash", "-euo", "pipefail", "-c"]
-
 RUN case $DEBIAN_VERSION in \
      # Version-specific installs for Bullseye (PG14-PG16):
      # The h3_pg extension needs a cmake 3.20+, but Debian bullseye has 3.18.
@@ -109,7 +106,6 @@ RUN cd postgres && \
 #
 #########################################################################################
 FROM build-deps AS postgis-build
-ARG DEBIAN_VERSION
 ARG PG_VERSION
 COPY --from=pg-build /usr/local/pgsql/ /usr/local/pgsql/
 RUN apt update && \
@@ -126,12 +122,12 @@ RUN apt update && \
 # and also we must check backward compatibility with older versions of PostGIS.
 #
 # Use new version only for v17
-RUN case "${DEBIAN_VERSION}" in \
-    "bookworm") \
+RUN case "${PG_VERSION}" in \
+    "v17") \
        export SFCGAL_VERSION=1.4.1 \
        export SFCGAL_CHECKSUM=1800c8a26241588f11cddcf433049e9b9aea902e923414d2ecef33a3295626c3 \
    ;; \
-    "bullseye") \
+    "v14" | "v15" | "v16") \
        export SFCGAL_VERSION=1.3.10 \
        export SFCGAL_CHECKSUM=4e39b3b2adada6254a7bdba6d297bb28e1a9835a9f879b74f37e2dab70203232 \
    ;; \
@@ -232,8 +228,6 @@ FROM build-deps AS plv8-build
 ARG PG_VERSION
 COPY --from=pg-build /usr/local/pgsql/ /usr/local/pgsql/

-COPY compute/patches/plv8-3.1.10.patch /plv8-3.1.10.patch
-
 RUN apt update && \
    apt install --no-install-recommends -y ninja-build python3-dev libncurses5 binutils clang

@@ -245,6 +239,8 @@ RUN apt update && \
 #
 # Use new version only for v17
 # because since v3.2, plv8 doesn't include plcoffee and plls extensions
+ENV PLV8_TAG=v3.2.3
+
 RUN case "${PG_VERSION}" in \
    "v17") \
        export PLV8_TAG=v3.2.3 \
@@ -259,9 +255,8 @@ RUN case "${PG_VERSION}" in \
    git clone --recurse-submodules --depth 1 --branch ${PLV8_TAG} https://github.com/plv8/plv8.git plv8-src && \
    tar -czf plv8.tar.gz --exclude .git plv8-src && \
    cd plv8-src && \
-    if [[ "${PG_VERSION}" < "v17" ]]; then patch -p1 < /plv8-3.1.10.patch; fi && \
    # generate and copy upgrade scripts
-    mkdir -p upgrade && ./generate_upgrade.sh ${PLV8_TAG#v} && \
+    mkdir -p upgrade && ./generate_upgrade.sh 3.1.10 && \
    cp upgrade/* /usr/local/pgsql/share/extension/ && \
    export PATH="/usr/local/pgsql/bin:$PATH" && \
    make DOCKER=1 -j $(getconf _NPROCESSORS_ONLN) install && \
@@ -358,10 +353,10 @@ COPY compute/patches/pgvector.patch /pgvector.patch
 # because we build the images on different machines than where we run them.
 # Pass OPTFLAGS="" to remove it.
 #
-# vector >0.7.4 supports v17
-# last release v0.8.0 - Oct 30, 2024
-RUN wget https://github.com/pgvector/pgvector/archive/refs/tags/v0.8.0.tar.gz -O pgvector.tar.gz && \
-    echo "867a2c328d4928a5a9d6f052cd3bc78c7d60228a9b914ad32aa3db88e9de27b0 pgvector.tar.gz" | sha256sum --check && \
+# vector 0.7.4 supports v17
+# last release v0.7.4 - Aug 5, 2024
+RUN wget https://github.com/pgvector/pgvector/archive/refs/tags/v0.7.4.tar.gz -O pgvector.tar.gz && \
+    echo "0341edf89b1924ae0d552f617e14fb7f8867c0194ed775bcc44fa40288642583 pgvector.tar.gz" | sha256sum --check && \
    mkdir pgvector-src && cd pgvector-src && tar xzf ../pgvector.tar.gz --strip-components=1 -C . && \
    patch -p1 < /pgvector.patch && \
    make -j $(getconf _NPROCESSORS_ONLN) OPTFLAGS="" PG_CONFIG=/usr/local/pgsql/bin/pg_config && \
@@ -1367,12 +1362,15 @@ RUN make PG_VERSION="${PG_VERSION}" -C compute

 FROM neon-pg-ext-build AS neon-pg-ext-test
 ARG PG_VERSION
-RUN mkdir /ext-src
+RUN case "${PG_VERSION}" in "v17") \
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    mkdir /ext-src

 #COPY --from=postgis-build /postgis.tar.gz /ext-src/
 #COPY --from=postgis-build /sfcgal/* /usr
 COPY --from=plv8-build /plv8.tar.gz /ext-src/
-#COPY --from=h3-pg-build /h3-pg.tar.gz /ext-src/
+COPY --from=h3-pg-build /h3-pg.tar.gz /ext-src/
 COPY --from=unit-pg-build /postgresql-unit.tar.gz /ext-src/
 COPY --from=vector-pg-build /pgvector.tar.gz /ext-src/
 COPY --from=vector-pg-build /pgvector.patch /ext-src/
@@ -1392,7 +1390,7 @@ COPY --from=hll-pg-build /hll.tar.gz /ext-src
 COPY --from=plpgsql-check-pg-build /plpgsql_check.tar.gz /ext-src
 #COPY --from=timescaledb-pg-build /timescaledb.tar.gz /ext-src
 COPY --from=pg-hint-plan-pg-build /pg_hint_plan.tar.gz /ext-src
-COPY compute/patches/pg_hint_plan_${PG_VERSION}.patch /ext-src
+COPY compute/patches/pg_hint_plan.patch /ext-src
 COPY --from=pg-cron-pg-build /pg_cron.tar.gz /ext-src
 COPY compute/patches/pg_cron.patch /ext-src
 #COPY --from=pg-pgx-ulid-build /home/nonroot/pgx_ulid.tar.gz /ext-src
@@ -1402,23 +1400,38 @@ COPY --from=pg-roaringbitmap-pg-build /pg_roaringbitmap.tar.gz /ext-src
 COPY --from=pg-semver-pg-build /pg_semver.tar.gz /ext-src
 #COPY --from=pg-embedding-pg-build /home/nonroot/pg_embedding-src/ /ext-src
 #COPY --from=wal2json-pg-build /wal2json_2_5.tar.gz /ext-src
-#pg_anon is not supported yet for pg v17 so, don't fail if nothing found
-COPY --from=pg-anon-pg-build /pg_anon.tar.g? /ext-src
+COPY --from=pg-anon-pg-build /pg_anon.tar.gz /ext-src
 COPY compute/patches/pg_anon.patch /ext-src
 COPY --from=pg-ivm-build /pg_ivm.tar.gz /ext-src
 COPY --from=pg-partman-build /pg_partman.tar.gz /ext-src
-RUN cd /ext-src/ && for f in *.tar.gz; \
+RUN case "${PG_VERSION}" in "v17") \
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    cd /ext-src/ && for f in *.tar.gz; \
    do echo $f; dname=$(echo $f | sed 's/\.tar.*//')-src; \
    rm -rf $dname; mkdir $dname; tar xzf $f --strip-components=1 -C $dname \
    || exit 1; rm -f $f; done
-RUN cd /ext-src/rum-src && patch -p1 <../rum.patch
-RUN cd /ext-src/pgvector-src && patch -p1 <../pgvector.patch
-RUN cd /ext-src/pg_hint_plan-src && patch -p1 < /ext-src/pg_hint_plan_${PG_VERSION}.patch
+RUN case "${PG_VERSION}" in "v17") \
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    cd /ext-src/rum-src && patch -p1 <../rum.patch
+RUN case "${PG_VERSION}" in "v17") \
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    cd /ext-src/pgvector-src && patch -p1 <../pgvector.patch
+RUN case "${PG_VERSION}" in "v17") \
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    cd /ext-src/pg_hint_plan-src && patch -p1 < /ext-src/pg_hint_plan.patch
 COPY --chmod=755 docker-compose/run-tests.sh /run-tests.sh
 RUN case "${PG_VERSION}" in "v17") \
-    echo "postgresql_anonymizer does not yet support PG17" && exit 0;; \
-    esac && patch -p1 </ext-src/pg_anon.patch
-RUN patch -p1 </ext-src/pg_cron.patch
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    patch -p1 </ext-src/pg_anon.patch
+RUN case "${PG_VERSION}" in "v17") \
+    echo "v17 extensions are not supported yet. Quit" && exit 0;; \
+    esac && \
+    patch -p1 </ext-src/pg_cron.patch
 ENV PATH=/usr/local/pgsql/bin:$PATH
 ENV PGHOST=compute
 ENV PGPORT=55433
--- a/compute/etc/pgbouncer.ini
+++ b/compute/etc/pgbouncer.ini
@@ -1,9 +1,5 @@
 [databases]
-;; pgbouncer propagates application_name (if it's specified) to the server, but some
-;; clients don't set it. We set default application_name=pgbouncer to make it
-;; easier to identify pgbouncer connections in Postgres. If client sets
-;; application_name, it will be used instead.
-*=host=localhost port=5432 auth_user=cloud_admin application_name=pgbouncer
+*=host=localhost port=5432 auth_user=cloud_admin
 [pgbouncer]
 listen_port=6432
 listen_addr=0.0.0.0
--- a/compute/patches/pg_hint_plan_v16.patch
+++ b/compute/patches/pg_hint_plan_v16.patch
--- a/compute/patches/pg_hint_plan_v17.patch
+++ b/compute/patches/pg_hint_plan_v17.patch
@@ -1,174 +0,0 @@
-diff --git a/expected/ut-A.out b/expected/ut-A.out
-index e7d68a1..65a056c 100644
--- a/expected/ut-A.out
-+++ b/expected/ut-A.out
-@@ -9,13 +9,16 @@ SET search_path TO public;
- ----
- -- No.A-1-1-3
- CREATE EXTENSION pg_hint_plan;
-+LOG:  Sending request to compute_ctl: http://localhost:3080/extension_server/pg_hint_plan
- -- No.A-1-2-3
- DROP EXTENSION pg_hint_plan;
- -- No.A-1-1-4
- CREATE SCHEMA other_schema;
- CREATE EXTENSION pg_hint_plan SCHEMA other_schema;
-+LOG:  Sending request to compute_ctl: http://localhost:3080/extension_server/pg_hint_plan
- ERROR:  extension "pg_hint_plan" must be installed in schema "hint_plan"
- CREATE EXTENSION pg_hint_plan;
-+LOG:  Sending request to compute_ctl: http://localhost:3080/extension_server/pg_hint_plan
- DROP SCHEMA other_schema;
- ----
- ---- No. A-5-1 comment pattern
-diff --git a/expected/ut-J.out b/expected/ut-J.out
-index 2fa3c70..314e929 100644
--- a/expected/ut-J.out
-+++ b/expected/ut-J.out
-@@ -789,38 +789,6 @@ NestLoop(st1 st2)
- MergeJoin(t1 t2)
- not used hint:
- duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-NestLoop(st1 st2)
-MergeJoin(t1 t2)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-NestLoop(st1 st2)
-MergeJoin(t1 t2)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-NestLoop(st1 st2)
-MergeJoin(t1 t2)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-NestLoop(st1 st2)
-MergeJoin(t1 t2)
-duplication hint:
- error hint:
- 
-                                        explain_filter                                        
-diff --git a/expected/ut-S.out b/expected/ut-S.out
-index 0bfcfb8..e75f581 100644
--- a/expected/ut-S.out
-+++ b/expected/ut-S.out
-@@ -4415,34 +4415,6 @@ used hint:
- IndexScan(ti1 ti1_pred)
- not used hint:
- duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(ti1 ti1_pred)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(ti1 ti1_pred)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(ti1 ti1_pred)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(ti1 ti1_pred)
-duplication hint:
- error hint:
- 
-                     explain_filter                     
-diff --git a/expected/ut-W.out b/expected/ut-W.out
-index a09bd34..0ad227c 100644
--- a/expected/ut-W.out
-+++ b/expected/ut-W.out
-@@ -1341,54 +1341,6 @@ IndexScan(ft1)
- IndexScan(t)
- Parallel(s1 3 hard)
- duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(*VALUES*)
-SeqScan(cte1)
-IndexScan(ft1)
-IndexScan(t)
-Parallel(p1 5 hard)
-Parallel(s1 3 hard)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(*VALUES*)
-SeqScan(cte1)
-IndexScan(ft1)
-IndexScan(t)
-Parallel(p1 5 hard)
-Parallel(s1 3 hard)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(*VALUES*)
-SeqScan(cte1)
-IndexScan(ft1)
-IndexScan(t)
-Parallel(p1 5 hard)
-Parallel(s1 3 hard)
-duplication hint:
-error hint:
-
-LOG:  pg_hint_plan:
-used hint:
-not used hint:
-IndexScan(*VALUES*)
-SeqScan(cte1)
-IndexScan(ft1)
-IndexScan(t)
-Parallel(p1 5 hard)
-Parallel(s1 3 hard)
-duplication hint:
- error hint:
- 
-                     explain_filter                    
-diff --git a/expected/ut-fdw.out b/expected/ut-fdw.out
-index 017fa4b..98d989b 100644
--- a/expected/ut-fdw.out
-+++ b/expected/ut-fdw.out
-@@ -7,6 +7,7 @@ SET pg_hint_plan.debug_print TO on;
- SET client_min_messages TO LOG;
- SET pg_hint_plan.enable_hint TO on;
- CREATE EXTENSION file_fdw;
-+LOG:  Sending request to compute_ctl: http://localhost:3080/extension_server/file_fdw
- CREATE SERVER file_server FOREIGN DATA WRAPPER file_fdw;
- CREATE USER MAPPING FOR PUBLIC SERVER file_server;
- CREATE FOREIGN TABLE ft1 (id int, val int) SERVER file_server OPTIONS (format 'csv', filename :'filename');
--- a/compute/patches/plv8-3.1.10.patch
+++ b/compute/patches/plv8-3.1.10.patch
@@ -1,42 +0,0 @@
-commit 46b38d3e46f9cd6c70d9b189dd6ff4abaa17cf5e
-Author: Alexander Bayandin <alexander@neon.tech>
-Date:   Sat Nov 30 18:29:32 2024 +0000
-
-    Fix v8 9.7.37 compilation on Debian 12
-
-diff --git a/patches/code/84cf3230a9680aac3b73c410c2b758760b6d3066.patch b/patches/code/84cf3230a9680aac3b73c410c2b758760b6d3066.patch
-new file mode 100644
-index 0000000..f0a5dc7
--- /dev/null
-+++ b/patches/code/84cf3230a9680aac3b73c410c2b758760b6d3066.patch
-@@ -0,0 +1,30 @@
-+From 84cf3230a9680aac3b73c410c2b758760b6d3066 Mon Sep 17 00:00:00 2001
-+From: Michael Lippautz <mlippautz@chromium.org>
-+Date: Thu, 27 Jan 2022 14:14:11 +0100
-+Subject: [PATCH] cppgc: Fix include
-+
-+Add <utility> to cover for std::exchange.
-+
-+Bug: v8:12585
-+Change-Id: Ida65144e93e466be8914527d0e646f348c136bcb
-+Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3420309
-+Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
-+Reviewed-by: Omer Katz <omerkatz@chromium.org>
-+Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
-+Cr-Commit-Position: refs/heads/main@{#78820}
-+---
-+ src/heap/cppgc/prefinalizer-handler.h | 1 +
-+ 1 file changed, 1 insertion(+)
-+
-+diff --git a/src/heap/cppgc/prefinalizer-handler.h b/src/heap/cppgc/prefinalizer-handler.h
-+index bc17c99b1838..c82c91ff5a45 100644
-+--- a/src/heap/cppgc/prefinalizer-handler.h
-++++ b/src/heap/cppgc/prefinalizer-handler.h
-+@@ -5,6 +5,7 @@
-+ #ifndef V8_HEAP_CPPGC_PREFINALIZER_HANDLER_H_
-+ #define V8_HEAP_CPPGC_PREFINALIZER_HANDLER_H_
-+ 
-++#include <utility>
-+ #include <vector>
-+ 
-+ #include "include/cppgc/prefinalizer.h"
--- a/compute_tools/src/bin/compute_ctl.rs
+++ b/compute_tools/src/bin/compute_ctl.rs
@@ -335,7 +335,6 @@ fn wait_spec(
        pgdata: pgdata.to_string(),
        pgbin: pgbin.to_string(),
        pgversion: get_pg_version_string(pgbin),
-        http_port,
        live_config_allowed,
        state: Mutex::new(new_state),
        state_changed: Condvar::new(),
@@ -390,6 +389,7 @@ fn wait_spec(

    Ok(WaitSpecResult {
        compute,
+        http_port,
        resize_swap_on_bind,
        set_disk_quota_for_fs: set_disk_quota_for_fs.cloned(),
    })
@@ -397,6 +397,8 @@ fn wait_spec(

 struct WaitSpecResult {
    compute: Arc<ComputeNode>,
+    // passed through from ProcessCliResult
+    http_port: u16,
    resize_swap_on_bind: bool,
    set_disk_quota_for_fs: Option<String>,
 }
@@ -406,6 +408,7 @@ fn start_postgres(
    #[allow(unused_variables)] matches: &clap::ArgMatches,
    WaitSpecResult {
        compute,
+        http_port,
        resize_swap_on_bind,
        set_disk_quota_for_fs,
    }: WaitSpecResult,
@@ -478,10 +481,12 @@ fn start_postgres(
        }
    }

+    let extension_server_port: u16 = http_port;
+
    // Start Postgres
    let mut pg = None;
    if !prestartup_failed {
-        pg = match compute.start_compute() {
+        pg = match compute.start_compute(extension_server_port) {
            Ok(pg) => Some(pg),
            Err(err) => {
                error!("could not start the compute node: {:#}", err);
--- a/compute_tools/src/compute.rs
+++ b/compute_tools/src/compute.rs
@@ -79,8 +79,6 @@ pub struct ComputeNode {
    /// - we push spec and it does configuration
    /// - but then it is restarted without any spec again
    pub live_config_allowed: bool,
-    /// The port that the compute's HTTP server listens on
-    pub http_port: u16,
    /// Volatile part of the `ComputeNode`, which should be used under `Mutex`.
    /// To allow HTTP API server to serving status requests, while configuration
    /// is in progress, lock should be held only for short periods of time to do
@@ -613,7 +611,11 @@ impl ComputeNode {
    /// Do all the preparations like PGDATA directory creation, configuration,
    /// safekeepers sync, basebackup, etc.
    #[instrument(skip_all)]
-    pub fn prepare_pgdata(&self, compute_state: &ComputeState) -> Result<()> {
+    pub fn prepare_pgdata(
+        &self,
+        compute_state: &ComputeState,
+        extension_server_port: u16,
+    ) -> Result<()> {
        let pspec = compute_state.pspec.as_ref().expect("spec must be set");
        let spec = &pspec.spec;
        let pgdata_path = Path::new(&self.pgdata);
@@ -623,7 +625,7 @@ impl ComputeNode {
        config::write_postgres_conf(
            &pgdata_path.join("postgresql.conf"),
            &pspec.spec,
-            self.http_port,
+            Some(extension_server_port),
        )?;

        // Syncing safekeepers is only safe with primary nodes: if a primary
@@ -1241,7 +1243,7 @@ impl ComputeNode {
        // Write new config
        let pgdata_path = Path::new(&self.pgdata);
        let postgresql_conf_path = pgdata_path.join("postgresql.conf");
-        config::write_postgres_conf(&postgresql_conf_path, &spec, self.http_port)?;
+        config::write_postgres_conf(&postgresql_conf_path, &spec, None)?;

        // TODO(ololobus): We need a concurrency during reconfiguration as well,
        // but DB is already running and used by user. We can easily get out of
@@ -1282,7 +1284,10 @@ impl ComputeNode {
    }

    #[instrument(skip_all)]
-    pub fn start_compute(&self) -> Result<(std::process::Child, std::thread::JoinHandle<()>)> {
+    pub fn start_compute(
+        &self,
+        extension_server_port: u16,
+    ) -> Result<(std::process::Child, std::thread::JoinHandle<()>)> {
        let compute_state = self.state.lock().unwrap().clone();
        let pspec = compute_state.pspec.as_ref().expect("spec must be set");
        info!(
@@ -1357,7 +1362,7 @@ impl ComputeNode {
            info!("{:?}", remote_ext_metrics);
        }

-        self.prepare_pgdata(&compute_state)?;
+        self.prepare_pgdata(&compute_state, extension_server_port)?;

        let start_time = Utc::now();
        let pg_process = self.start_postgres(pspec.storage_auth_token.clone())?;
--- a/compute_tools/src/config.rs
+++ b/compute_tools/src/config.rs
@@ -37,7 +37,7 @@ pub fn line_in_file(path: &Path, line: &str) -> Result<bool> {
 pub fn write_postgres_conf(
    path: &Path,
    spec: &ComputeSpec,
-    extension_server_port: u16,
+    extension_server_port: Option<u16>,
 ) -> Result<()> {
    // File::create() destroys the file content if it exists.
    let mut file = File::create(path)?;
@@ -127,7 +127,9 @@ pub fn write_postgres_conf(
        writeln!(file, "# Managed by compute_ctl: end")?;
    }

-    writeln!(file, "neon.extension_server_port={}", extension_server_port)?;
+    if let Some(port) = extension_server_port {
+        writeln!(file, "neon.extension_server_port={}", port)?;
+    }

    // This is essential to keep this line at the end of the file,
    // because it is intended to override any settings above.
--- a/control_plane/src/endpoint.rs
+++ b/control_plane/src/endpoint.rs
@@ -310,10 +310,6 @@ impl Endpoint {
        conf.append("wal_log_hints", "off");
        conf.append("max_replication_slots", "10");
        conf.append("hot_standby", "on");
-        // Set to 1MB to both exercise getPage requests/LFC, and still have enough room for
-        // Postgres to operate. Everything smaller might be not enough for Postgres under load,
-        // and can cause errors like 'no unpinned buffers available', see
-        // <https://github.com/neondatabase/neon/issues/9956>
        conf.append("shared_buffers", "1MB");
        conf.append("fsync", "off");
        conf.append("max_connections", "100");
--- a/control_plane/src/safekeeper.rs
+++ b/control_plane/src/safekeeper.rs
@@ -5,7 +5,6 @@
 //! ```text
 //!   .neon/safekeepers/<safekeeper id>
 //! ```
-use std::error::Error as _;
 use std::future::Future;
 use std::io::Write;
 use std::path::PathBuf;
@@ -27,7 +26,7 @@ use crate::{

 #[derive(Error, Debug)]
 pub enum SafekeeperHttpError {
-    #[error("request error: {0}{}", .0.source().map(|e| format!(": {e}")).unwrap_or_default())]
+    #[error("Reqwest error: {0}")]
    Transport(#[from] reqwest::Error),

    #[error("Error: {0}")]
--- a/control_plane/storcon_cli/src/main.rs
+++ b/control_plane/storcon_cli/src/main.rs
@@ -560,26 +560,14 @@ async fn main() -> anyhow::Result<()> {
                .await?;
        }
        Command::TenantDescribe { tenant_id } => {
-            let TenantDescribeResponse {
-                tenant_id,
-                shards,
-                stripe_size,
-                policy,
-                config,
-            } = storcon_client
+            let describe_response = storcon_client
                .dispatch::<(), TenantDescribeResponse>(
                    Method::GET,
                    format!("control/v1/tenant/{tenant_id}"),
                    None,
                )
                .await?;
-            println!("Tenant {tenant_id}");
-            let mut table = comfy_table::Table::new();
-            table.add_row(["Policy", &format!("{:?}", policy)]);
-            table.add_row(["Stripe size", &format!("{:?}", stripe_size)]);
-            table.add_row(["Config", &serde_json::to_string_pretty(&config).unwrap()]);
-            println!("{table}");
-            println!("Shards:");
+            let shards = describe_response.shards;
            let mut table = comfy_table::Table::new();
            table.set_header(["Shard", "Attached", "Secondary", "Last error", "status"]);
            for shard in shards {
--- a/docker-compose/compute_wrapper/Dockerfile
+++ b/docker-compose/compute_wrapper/Dockerfile
@@ -4,16 +4,14 @@ ARG TAG=latest

 FROM $REPOSITORY/${COMPUTE_IMAGE}:$TAG

-ARG COMPUTE_IMAGE
-
 USER root
 RUN apt-get update &&       \
    apt-get install -y curl \
                       jq   \
                       python3-pip \
-                       netcat-openbsd
+                       netcat
 #Faker is required for the pg_anon test
-RUN case $COMPUTE_IMAGE in compute-node-v17) OPT="--break-system-packages";; *) OPT= ;; esac && pip3 install $OPT Faker
+RUN pip3 install Faker
 #This is required for the pg_hintplan test
 RUN mkdir -p /ext-src/pg_hint_plan-src && chown postgres /ext-src/pg_hint_plan-src 

--- a/docker-compose/docker_compose_test.sh
+++ b/docker-compose/docker_compose_test.sh
@@ -30,17 +30,10 @@ cleanup() {
    docker compose --profile test-extensions -f $COMPOSE_FILE down
 }

-for pg_version in ${TEST_VERSION_ONLY-14 15 16 17}; do
-    pg_version=${pg_version/v/}
+for pg_version in 14 15 16; do
    echo "clean up containers if exists"
    cleanup
-    PG_TEST_VERSION=$((pg_version < 16 ? 16 : pg_version))
-    # The support of pg_anon not yet added to PG17, so we have to remove the corresponding option
-    if [ $pg_version -eq 17 ]; then
-      SPEC_PATH="compute_wrapper/var/db/postgres/specs"
-      mv $SPEC_PATH/spec.json $SPEC_PATH/spec.bak
-      jq 'del(.cluster.settings[] | select (.name == "session_preload_libraries"))' $SPEC_PATH/spec.bak > $SPEC_PATH/spec.json
-    fi
+    PG_TEST_VERSION=$(($pg_version < 16 ? 16 : $pg_version))
    PG_VERSION=$pg_version PG_TEST_VERSION=$PG_TEST_VERSION docker compose --profile test-extensions -f $COMPOSE_FILE up --build -d

    echo "wait until the compute is ready. timeout after 60s. "
@@ -61,7 +54,8 @@ for pg_version in ${TEST_VERSION_ONLY-14 15 16 17}; do
        fi
    done

-    if [ $pg_version -ge 16 ]; then
+    if [ $pg_version -ge 16 ]
+    then
        echo Enabling trust connection
        docker exec $COMPUTE_CONTAINER_NAME bash -c "sed -i '\$d' /var/db/postgres/compute/pg_hba.conf && echo -e 'host\t all\t all\t all\t trust' >> /var/db/postgres/compute/pg_hba.conf && psql $PSQL_OPTION -c 'select pg_reload_conf()' "
        echo Adding postgres role
@@ -74,13 +68,10 @@ for pg_version in ${TEST_VERSION_ONLY-14 15 16 17}; do
        # The test assumes that it is running on the same host with the postgres engine.
        # In our case it's not true, that's why we are copying files to the compute node
        TMPDIR=$(mktemp -d)
-        # Add support for pg_anon for pg_v16
-        if [ $pg_version -ne 17 ]; then
-          docker cp $TEST_CONTAINER_NAME:/ext-src/pg_anon-src/data $TMPDIR/data
-          echo -e '1\t too \t many \t tabs' > $TMPDIR/data/bad.csv
-          docker cp $TMPDIR/data $COMPUTE_CONTAINER_NAME:/tmp/tmp_anon_alternate_data
+        docker cp $TEST_CONTAINER_NAME:/ext-src/pg_anon-src/data $TMPDIR/data
+        echo -e '1\t too \t many \t tabs' > $TMPDIR/data/bad.csv
+        docker cp $TMPDIR/data $COMPUTE_CONTAINER_NAME:/tmp/tmp_anon_alternate_data
        rm -rf $TMPDIR
-        fi
        TMPDIR=$(mktemp -d)
        # The following block does the same for the pg_hintplan test
        docker cp $TEST_CONTAINER_NAME:/ext-src/pg_hint_plan-src/data $TMPDIR/data
@@ -106,8 +97,4 @@ for pg_version in ${TEST_VERSION_ONLY-14 15 16 17}; do
        fi
    fi
    cleanup
-    # The support of pg_anon not yet added to PG17, so we have to remove the corresponding option
-    if [ $pg_version -eq 17 ]; then
-      mv $SPEC_PATH/spec.bak $SPEC_PATH/spec.json
-    fi
 done
--- a/libs/consumption_metrics/src/lib.rs
+++ b/libs/consumption_metrics/src/lib.rs
@@ -103,12 +103,11 @@ impl<'a> IdempotencyKey<'a> {
    }
 }

-/// Split into chunks of 1000 metrics to avoid exceeding the max request size.
 pub const CHUNK_SIZE: usize = 1000;

 // Just a wrapper around a slice of events
 // to serialize it as `{"events" : [ ] }
-#[derive(Debug, serde::Serialize, serde::Deserialize, PartialEq)]
-pub struct EventChunk<'a, T: Clone + PartialEq> {
+#[derive(serde::Serialize, Deserialize)]
+pub struct EventChunk<'a, T: Clone> {
    pub events: std::borrow::Cow<'a, [T]>,
 }
--- a/libs/pageserver_api/src/config.rs
+++ b/libs/pageserver_api/src/config.rs
@@ -442,14 +442,7 @@ impl Default for ConfigToml {
            tenant_config: TenantConfigToml::default(),
            no_sync: None,
            wal_receiver_protocol: DEFAULT_WAL_RECEIVER_PROTOCOL,
-            page_service_pipelining: if !cfg!(test) {
-                PageServicePipeliningConfig::Serial
-            } else {
-                PageServicePipeliningConfig::Pipelined(PageServicePipeliningConfigPipelined {
-                    max_batch_size: NonZeroUsize::new(32).unwrap(),
-                    execution: PageServiceProtocolPipelinedExecutionStrategy::ConcurrentFutures,
-                })
-            },
+            page_service_pipelining: PageServicePipeliningConfig::Serial,
        }
    }
 }
--- a/libs/pageserver_api/src/controller_api.rs
+++ b/libs/pageserver_api/src/controller_api.rs
@@ -48,7 +48,7 @@ pub struct TenantCreateResponse {
    pub shards: Vec<TenantCreateResponseShard>,
 }

-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize)]
 pub struct NodeRegisterRequest {
    pub node_id: NodeId,

@@ -75,7 +75,7 @@ pub struct TenantPolicyRequest {
    pub scheduling: Option<ShardSchedulingPolicy>,
 }

-#[derive(Clone, Serialize, Deserialize, PartialEq, Eq, Hash, Debug)]
+#[derive(Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
 pub struct AvailabilityZone(pub String);

 impl Display for AvailabilityZone {
--- a/libs/pageserver_api/src/key.rs
+++ b/libs/pageserver_api/src/key.rs
@@ -770,11 +770,6 @@ impl Key {
            && self.field6 == 1
    }

-    #[inline(always)]
-    pub fn is_aux_file_key(&self) -> bool {
-        self.field1 == AUX_KEY_PREFIX
-    }
-
    /// Guaranteed to return `Ok()` if [`Self::is_rel_block_key`] returns `true` for `key`.
    #[inline(always)]
    pub fn to_rel_block(self) -> anyhow::Result<(RelTag, BlockNumber)> {
--- a/libs/pageserver_api/src/models.rs
+++ b/libs/pageserver_api/src/models.rs
@@ -501,9 +501,7 @@ pub struct EvictionPolicyLayerAccessThreshold {

 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
 pub struct ThrottleConfig {
-    /// See [`ThrottleConfigTaskKinds`] for why we do the serde `rename`.
-    #[serde(rename = "task_kinds")]
-    pub enabled: ThrottleConfigTaskKinds,
+    pub task_kinds: Vec<String>, // TaskKind
    pub initial: u32,
    #[serde(with = "humantime_serde")]
    pub refill_interval: Duration,
@@ -511,38 +509,10 @@ pub struct ThrottleConfig {
    pub max: u32,
 }

-/// Before <https://github.com/neondatabase/neon/pull/9962>
-/// the throttle was a per `Timeline::get`/`Timeline::get_vectored` call.
-/// The `task_kinds` field controlled which Pageserver "Task Kind"s
-/// were subject to the throttle.
-///
-/// After that PR, the throttle is applied at pagestream request level
-/// and the `task_kinds` field does not apply since the only task kind
-/// that us subject to the throttle is that of the page service.
-///
-/// However, we don't want to make a breaking config change right now
-/// because it means we have to migrate all the tenant configs.
-/// This will be done in a future PR.
-///
-/// In the meantime, we use emptiness / non-emptsiness of the `task_kinds`
-/// field to determine if the throttle is enabled or not.
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
-#[serde(transparent)]
-pub struct ThrottleConfigTaskKinds(Vec<String>);
-
-impl ThrottleConfigTaskKinds {
-    pub fn disabled() -> Self {
-        Self(vec![])
-    }
-    pub fn is_enabled(&self) -> bool {
-        !self.0.is_empty()
-    }
-}
-
 impl ThrottleConfig {
    pub fn disabled() -> Self {
        Self {
-            enabled: ThrottleConfigTaskKinds::disabled(),
+            task_kinds: vec![], // effectively disables the throttle
            // other values don't matter with emtpy `task_kinds`.
            initial: 0,
            refill_interval: Duration::from_millis(1),
@@ -556,30 +526,6 @@ impl ThrottleConfig {
    }
 }

-#[cfg(test)]
-mod throttle_config_tests {
-    use super::*;
-
-    #[test]
-    fn test_disabled_is_disabled() {
-        let config = ThrottleConfig::disabled();
-        assert!(!config.enabled.is_enabled());
-    }
-    #[test]
-    fn test_enabled_backwards_compat() {
-        let input = serde_json::json!({
-            "task_kinds": ["PageRequestHandler"],
-            "initial": 40000,
-            "refill_interval": "50ms",
-            "refill_amount": 1000,
-            "max": 40000,
-            "fair": true
-        });
-        let config: ThrottleConfig = serde_json::from_value(input).unwrap();
-        assert!(config.enabled.is_enabled());
-    }
-}
-
 /// A flattened analog of a `pagesever::tenant::LocationMode`, which
 /// lists out all possible states (and the virtual "Detached" state)
 /// in a flat form rather than using rust-style enums.
--- a/libs/pageserver_api/src/shard.rs
+++ b/libs/pageserver_api/src/shard.rs
@@ -170,37 +170,19 @@ impl ShardIdentity {
        }
    }

-    /// Return true if the key should be stored on all shards, not just one.
-    fn is_key_global(&self, key: &Key) -> bool {
-        if key.is_slru_block_key() || key.is_slru_segment_size_key() || key.is_aux_file_key() {
-            // Special keys that are only stored on shard 0
-            false
-        } else if key.is_rel_block_key() {
-            // Ordinary relation blocks are distributed across shards
-            false
-        } else if key.is_rel_size_key() {
-            // All shards maintain rel size keys (although only shard 0 is responsible for
-            // keeping it strictly accurate, other shards just reflect the highest block they've ingested)
-            true
-        } else {
-            // For everything else, we assume it must be kept everywhere, because ingest code
-            // might assume this -- this covers functionality where the ingest code has
-            // not (yet) been made fully shard aware.
-            true
-        }
-    }
-
    /// Return true if the key should be discarded if found in this shard's
    /// data store, e.g. during compaction after a split.
    ///
    /// Shards _may_ drop keys which return false here, but are not obliged to.
    pub fn is_key_disposable(&self, key: &Key) -> bool {
-        if self.count < ShardCount(2) {
-            // Fast path: unsharded tenant doesn't dispose of anything
-            return false;
-        }
-
-        if self.is_key_global(key) {
+        if key_is_shard0(key) {
+            // Q: Why can't we dispose of shard0 content if we're not shard 0?
+            // A1: because the WAL ingestion logic currently ingests some shard 0
+            //     content on all shards, even though it's only read on shard 0.  If we
+            //     dropped it, then subsequent WAL ingest to these keys would encounter
+            //     an error.
+            // A2: because key_is_shard0 also covers relation size keys, which are written
+            //     on all shards even though they're only maintained accurately on shard 0.
            false
        } else {
            !self.is_key_local(key)
--- a/libs/pq_proto/src/lib.rs
+++ b/libs/pq_proto/src/lib.rs
@@ -100,7 +100,7 @@ impl StartupMessageParamsBuilder {

 #[derive(Debug, Clone, Default)]
 pub struct StartupMessageParams {
-    pub params: Bytes,
+    params: Bytes,
 }

 impl StartupMessageParams {
@@ -565,8 +565,6 @@ pub enum BeMessage<'a> {
    /// Batch of interpreted, shard filtered WAL records,
    /// ready for the pageserver to ingest
    InterpretedWalRecords(InterpretedWalRecordsBody<'a>),
-
-    Raw(u8, &'a [u8]),
 }

 /// Common shorthands.
@@ -756,10 +754,6 @@ impl BeMessage<'_> {
    /// one more buffer.
    pub fn write(buf: &mut BytesMut, message: &BeMessage) -> Result<(), ProtocolError> {
        match message {
-            BeMessage::Raw(code, data) => {
-                buf.put_u8(*code);
-                write_body(buf, |b| b.put_slice(data))
-            }
            BeMessage::AuthenticationOk => {
                buf.put_u8(b'R');
                write_body(buf, |buf| {
--- a/libs/proxy/postgres-protocol2/Cargo.toml
+++ b/libs/proxy/postgres-protocol2/Cargo.toml
@@ -10,6 +10,7 @@ byteorder.workspace = true
 bytes.workspace = true
 fallible-iterator.workspace = true
 hmac.workspace = true
+md-5 = "0.10"
 memchr = "2.0"
 rand.workspace = true
 sha2.workspace = true
--- a/libs/proxy/postgres-protocol2/src/authentication/mod.rs
+++ b/libs/proxy/postgres-protocol2/src/authentication/mod.rs
@@ -1,2 +1,37 @@
 //! Authentication protocol support.
+use md5::{Digest, Md5};
+
 pub mod sasl;
+
+/// Hashes authentication information in a way suitable for use in response
+/// to an `AuthenticationMd5Password` message.
+///
+/// The resulting string should be sent back to the database in a
+/// `PasswordMessage` message.
+#[inline]
+pub fn md5_hash(username: &[u8], password: &[u8], salt: [u8; 4]) -> String {
+    let mut md5 = Md5::new();
+    md5.update(password);
+    md5.update(username);
+    let output = md5.finalize_reset();
+    md5.update(format!("{:x}", output));
+    md5.update(salt);
+    format!("md5{:x}", md5.finalize())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn md5() {
+        let username = b"md5_user";
+        let password = b"password";
+        let salt = [0x2a, 0x3d, 0x8f, 0xe0];
+
+        assert_eq!(
+            md5_hash(username, password, salt),
+            "md562af4dd09bbb41884907a838a3233294"
+        );
+    }
+}
--- a/libs/proxy/postgres-protocol2/src/authentication/sasl.rs
+++ b/libs/proxy/postgres-protocol2/src/authentication/sasl.rs
@@ -117,7 +117,7 @@ enum Credentials<const N: usize> {
    /// A regular password as a vector of bytes.
    Password(Vec<u8>),
    /// A precomputed pair of keys.
-    Keys(ScramKeys<N>),
+    Keys(Box<ScramKeys<N>>),
 }

 enum State {
@@ -176,7 +176,7 @@ impl ScramSha256 {

    /// Constructs a new instance which will use the provided key pair for authentication.
    pub fn new_with_keys(keys: ScramKeys<32>, channel_binding: ChannelBinding) -> ScramSha256 {
-        let password = Credentials::Keys(keys);
+        let password = Credentials::Keys(keys.into());
        ScramSha256::new_inner(password, channel_binding, nonce())
    }

--- a/libs/proxy/postgres-protocol2/src/message/backend.rs
+++ b/libs/proxy/postgres-protocol2/src/message/backend.rs
@@ -79,7 +79,7 @@ pub enum Message {
    AuthenticationCleartextPassword,
    AuthenticationGss,
    AuthenticationKerberosV5,
-    AuthenticationMd5Password,
+    AuthenticationMd5Password(AuthenticationMd5PasswordBody),
    AuthenticationOk,
    AuthenticationScmCredential,
    AuthenticationSspi,
@@ -191,7 +191,11 @@ impl Message {
                0 => Message::AuthenticationOk,
                2 => Message::AuthenticationKerberosV5,
                3 => Message::AuthenticationCleartextPassword,
-                5 => Message::AuthenticationMd5Password,
+                5 => {
+                    let mut salt = [0; 4];
+                    buf.read_exact(&mut salt)?;
+                    Message::AuthenticationMd5Password(AuthenticationMd5PasswordBody { salt })
+                }
                6 => Message::AuthenticationScmCredential,
                7 => Message::AuthenticationGss,
                8 => Message::AuthenticationGssContinue,
@@ -537,10 +541,6 @@ impl NoticeResponseBody {
    pub fn fields(&self) -> ErrorFields<'_> {
        ErrorFields { buf: &self.storage }
    }
-
-    pub fn as_bytes(&self) -> &[u8] {
-        &self.storage
-    }
 }

 pub struct NotificationResponseBody {
--- a/libs/proxy/postgres-protocol2/src/message/frontend.rs
+++ b/libs/proxy/postgres-protocol2/src/message/frontend.rs
@@ -255,34 +255,22 @@ pub fn ssl_request(buf: &mut BytesMut) {
 }

 #[inline]
-pub fn startup_message(parameters: &StartupMessageParams, buf: &mut BytesMut) -> io::Result<()> {
+pub fn startup_message<'a, I>(parameters: I, buf: &mut BytesMut) -> io::Result<()>
+where
+    I: IntoIterator<Item = (&'a str, &'a str)>,
+{
    write_body(buf, |buf| {
        // postgres protocol version 3.0(196608) in bigger-endian
        buf.put_i32(0x00_03_00_00);
-        buf.put_slice(&parameters.params);
+        for (key, value) in parameters {
+            write_cstr(key.as_bytes(), buf)?;
+            write_cstr(value.as_bytes(), buf)?;
+        }
        buf.put_u8(0);
        Ok(())
    })
 }

-#[derive(Debug, Clone, Default, PartialEq, Eq)]
-pub struct StartupMessageParams {
-    pub params: BytesMut,
-}
-
-impl StartupMessageParams {
-    /// Set parameter's value by its name.
-    pub fn insert(&mut self, name: &str, value: &str) {
-        if name.contains('\0') || value.contains('\0') {
-            panic!("startup parameter name or value contained a null")
-        }
-        self.params.put_slice(name.as_bytes());
-        self.params.put_u8(0);
-        self.params.put_slice(value.as_bytes());
-        self.params.put_u8(0);
-    }
-}
-
 #[inline]
 pub fn sync(buf: &mut BytesMut) {
    buf.put_u8(b'S');
--- a/libs/proxy/postgres-protocol2/src/password/mod.rs
+++ b/libs/proxy/postgres-protocol2/src/password/mod.rs
@@ -8,6 +8,7 @@

 use crate::authentication::sasl;
 use hmac::{Hmac, Mac};
+use md5::Md5;
 use rand::RngCore;
 use sha2::digest::FixedOutput;
 use sha2::{Digest, Sha256};
@@ -87,3 +88,20 @@ pub(crate) async fn scram_sha_256_salt(
        base64::encode(server_key)
    )
 }
+
+/// **Not recommended, as MD5 is not considered to be secure.**
+///
+/// Hash password using MD5 with the username as the salt.
+///
+/// The client may assume the returned string doesn't contain any
+/// special characters that would require escaping.
+pub fn md5(password: &[u8], username: &str) -> String {
+    // salt password with username
+    let mut salted_password = Vec::from(password);
+    salted_password.extend_from_slice(username.as_bytes());
+
+    let mut hash = Md5::new();
+    hash.update(&salted_password);
+    let digest = hash.finalize();
+    format!("md5{:x}", digest)
+}
--- a/libs/proxy/postgres-protocol2/src/password/test.rs
+++ b/libs/proxy/postgres-protocol2/src/password/test.rs
@@ -9,3 +9,11 @@ async fn test_encrypt_scram_sha_256() {
        "SCRAM-SHA-256$4096:AQIDBAUGBwgJCgsMDQ4PEA==$8rrDg00OqaiWXJ7p+sCgHEIaBSHY89ZJl3mfIsf32oY=:05L1f+yZbiN8O0AnO40Og85NNRhvzTS57naKRWCcsIA="
    );
 }
+
+#[test]
+fn test_encrypt_md5() {
+    assert_eq!(
+        password::md5(b"secret", "foo"),
+        "md54ab2c5d00339c4b2a4e921d2dc4edec7"
+    );
+}
--- a/libs/proxy/tokio-postgres2/src/cancel_token.rs
+++ b/libs/proxy/tokio-postgres2/src/cancel_token.rs
@@ -10,10 +10,10 @@ use tokio::net::TcpStream;
 /// connection.
 #[derive(Clone)]
 pub struct CancelToken {
-    pub socket_config: Option<SocketConfig>,
-    pub ssl_mode: SslMode,
-    pub process_id: i32,
-    pub secret_key: i32,
+    pub(crate) socket_config: Option<SocketConfig>,
+    pub(crate) ssl_mode: SslMode,
+    pub(crate) process_id: i32,
+    pub(crate) secret_key: i32,
 }

 impl CancelToken {
--- a/libs/proxy/tokio-postgres2/src/client.rs
+++ b/libs/proxy/tokio-postgres2/src/client.rs
@@ -138,7 +138,7 @@ impl InnerClient {
 }

 #[derive(Clone)]
-pub struct SocketConfig {
+pub(crate) struct SocketConfig {
    pub host: Host,
    pub port: u16,
    pub connect_timeout: Option<Duration>,
@@ -152,7 +152,7 @@ pub struct SocketConfig {
 pub struct Client {
    inner: Arc<InnerClient>,

-    socket_config: SocketConfig,
+    socket_config: Option<SocketConfig>,
    ssl_mode: SslMode,
    process_id: i32,
    secret_key: i32,
@@ -161,7 +161,6 @@ pub struct Client {
 impl Client {
    pub(crate) fn new(
        sender: mpsc::UnboundedSender<Request>,
-        socket_config: SocketConfig,
        ssl_mode: SslMode,
        process_id: i32,
        secret_key: i32,
@@ -173,7 +172,7 @@ impl Client {
                buffer: Default::default(),
            }),

-            socket_config,
+            socket_config: None,
            ssl_mode,
            process_id,
            secret_key,
@@ -189,6 +188,10 @@ impl Client {
        &self.inner
    }

+    pub(crate) fn set_socket_config(&mut self, socket_config: SocketConfig) {
+        self.socket_config = Some(socket_config);
+    }
+
    /// Creates a new prepared statement.
    ///
    /// Prepared statements can be executed repeatedly, and may contain query parameters (indicated by `$1`, `$2`, etc),
@@ -409,7 +412,7 @@ impl Client {
    /// connection associated with this client.
    pub fn cancel_token(&self) -> CancelToken {
        CancelToken {
-            socket_config: Some(self.socket_config.clone()),
+            socket_config: self.socket_config.clone(),
            ssl_mode: self.ssl_mode,
            process_id: self.process_id,
            secret_key: self.secret_key,
--- a/libs/proxy/tokio-postgres2/src/codec.rs
+++ b/libs/proxy/tokio-postgres2/src/codec.rs
@@ -35,7 +35,9 @@ impl FallibleIterator for BackendMessages {
    }
 }

-pub struct PostgresCodec;
+pub struct PostgresCodec {
+    pub max_message_size: Option<usize>,
+}

 impl Encoder<FrontendMessage> for PostgresCodec {
    type Error = io::Error;
@@ -64,6 +66,15 @@ impl Decoder for PostgresCodec {
                break;
            }

+            if let Some(max) = self.max_message_size {
+                if len > max {
+                    return Err(io::Error::new(
+                        io::ErrorKind::InvalidInput,
+                        "message too large",
+                    ));
+                }
+            }
+
            match header.tag() {
                backend::NOTICE_RESPONSE_TAG
                | backend::NOTIFICATION_RESPONSE_TAG
--- a/libs/proxy/tokio-postgres2/src/config.rs
+++ b/libs/proxy/tokio-postgres2/src/config.rs
@@ -2,19 +2,29 @@

 use crate::connect::connect;
 use crate::connect_raw::connect_raw;
-use crate::connect_raw::RawConnection;
 use crate::tls::MakeTlsConnect;
 use crate::tls::TlsConnect;
 use crate::{Client, Connection, Error};
-use postgres_protocol2::message::frontend::StartupMessageParams;
-use std::fmt;
+use std::borrow::Cow;
 use std::str;
+use std::str::FromStr;
 use std::time::Duration;
+use std::{error, fmt, iter, mem};
 use tokio::io::{AsyncRead, AsyncWrite};

 pub use postgres_protocol2::authentication::sasl::ScramKeys;
 use tokio::net::TcpStream;

+/// Properties required of a session.
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[non_exhaustive]
+pub enum TargetSessionAttrs {
+    /// No special properties are required.
+    Any,
+    /// The session must allow writes.
+    ReadWrite,
+}
+
 /// TLS configuration.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[non_exhaustive]
@@ -64,37 +74,119 @@ pub enum AuthKeys {
 }

 /// Connection configuration.
+///
+/// Configuration can be parsed from libpq-style connection strings. These strings come in two formats:
+///
+/// # Key-Value
+///
+/// This format consists of space-separated key-value pairs. Values which are either the empty string or contain
+/// whitespace should be wrapped in `'`. `'` and `\` characters should be backslash-escaped.
+///
+/// ## Keys
+///
+/// * `user` - The username to authenticate with. Required.
+/// * `password` - The password to authenticate with.
+/// * `dbname` - The name of the database to connect to. Defaults to the username.
+/// * `options` - Command line options used to configure the server.
+/// * `application_name` - Sets the `application_name` parameter on the server.
+/// * `sslmode` - Controls usage of TLS. If set to `disable`, TLS will not be used. If set to `prefer`, TLS will be used
+///     if available, but not used otherwise. If set to `require`, TLS will be forced to be used. Defaults to `prefer`.
+/// * `host` - The host to connect to. On Unix platforms, if the host starts with a `/` character it is treated as the
+///     path to the directory containing Unix domain sockets. Otherwise, it is treated as a hostname. Multiple hosts
+///     can be specified, separated by commas. Each host will be tried in turn when connecting. Required if connecting
+///     with the `connect` method.
+/// * `port` - The port to connect to. Multiple ports can be specified, separated by commas. The number of ports must be
+///     either 1, in which case it will be used for all hosts, or the same as the number of hosts. Defaults to 5432 if
+///     omitted or the empty string.
+/// * `connect_timeout` - The time limit in seconds applied to each socket-level connection attempt. Note that hostnames
+///     can resolve to multiple IP addresses, and this limit is applied to each address. Defaults to no timeout.
+/// * `target_session_attrs` - Specifies requirements of the session. If set to `read-write`, the client will check that
+///     the `transaction_read_write` session parameter is set to `on`. This can be used to connect to the primary server
+///     in a database cluster as opposed to the secondary read-only mirrors. Defaults to `all`.
+/// * `channel_binding` - Controls usage of channel binding in the authentication process. If set to `disable`, channel
+///     binding will not be used. If set to `prefer`, channel binding will be used if available, but not used otherwise.
+///     If set to `require`, the authentication process will fail if channel binding is not used. Defaults to `prefer`.
+///
+/// ## Examples
+///
+/// ```not_rust
+/// host=localhost user=postgres connect_timeout=10 keepalives=0
+/// ```
+///
+/// ```not_rust
+/// host=/var/lib/postgresql,localhost port=1234 user=postgres password='password with spaces'
+/// ```
+///
+/// ```not_rust
+/// host=host1,host2,host3 port=1234,,5678 user=postgres target_session_attrs=read-write
+/// ```
+///
+/// # Url
+///
+/// This format resembles a URL with a scheme of either `postgres://` or `postgresql://`. All components are optional,
+/// and the format accepts query parameters for all of the key-value pairs described in the section above. Multiple
+/// host/port pairs can be comma-separated. Unix socket paths in the host section of the URL should be percent-encoded,
+/// as the path component of the URL specifies the database name.
+///
+/// ## Examples
+///
+/// ```not_rust
+/// postgresql://user@localhost
+/// ```
+///
+/// ```not_rust
+/// postgresql://user:password@%2Fvar%2Flib%2Fpostgresql/mydb?connect_timeout=10
+/// ```
+///
+/// ```not_rust
+/// postgresql://user@host1:1234,host2,host3:5678?target_session_attrs=read-write
+/// ```
+///
+/// ```not_rust
+/// postgresql:///mydb?user=user&host=/var/lib/postgresql
+/// ```
 #[derive(Clone, PartialEq, Eq)]
 pub struct Config {
-    pub(crate) host: Host,
-    pub(crate) port: u16,
-
+    pub(crate) user: Option<String>,
    pub(crate) password: Option<Vec<u8>>,
    pub(crate) auth_keys: Option<Box<AuthKeys>>,
+    pub(crate) dbname: Option<String>,
+    pub(crate) options: Option<String>,
+    pub(crate) application_name: Option<String>,
    pub(crate) ssl_mode: SslMode,
+    pub(crate) host: Vec<Host>,
+    pub(crate) port: Vec<u16>,
    pub(crate) connect_timeout: Option<Duration>,
+    pub(crate) target_session_attrs: TargetSessionAttrs,
    pub(crate) channel_binding: ChannelBinding,
-    pub(crate) server_params: StartupMessageParams,
+    pub(crate) replication_mode: Option<ReplicationMode>,
+    pub(crate) max_backend_message_size: Option<usize>,
+}

-    database: bool,
-    username: bool,
+impl Default for Config {
+    fn default() -> Config {
+        Config::new()
+    }
 }

 impl Config {
    /// Creates a new configuration.
-    pub fn new(host: String, port: u16) -> Config {
+    pub fn new() -> Config {
        Config {
-            host: Host::Tcp(host),
-            port,
+            user: None,
            password: None,
            auth_keys: None,
+            dbname: None,
+            options: None,
+            application_name: None,
            ssl_mode: SslMode::Prefer,
+            host: vec![],
+            port: vec![],
            connect_timeout: None,
+            target_session_attrs: TargetSessionAttrs::Any,
            channel_binding: ChannelBinding::Prefer,
-            server_params: StartupMessageParams::default(),
-
-            database: false,
-            username: false,
+            replication_mode: None,
+            max_backend_message_size: None,
        }
    }

@@ -102,13 +194,14 @@ impl Config {
    ///
    /// Required.
    pub fn user(&mut self, user: &str) -> &mut Config {
-        self.set_param("user", user)
+        self.user = Some(user.to_string());
+        self
    }

    /// Gets the user to authenticate with, if one has been configured with
    /// the `user` method.
-    pub fn user_is_set(&self) -> bool {
-        self.username
+    pub fn get_user(&self) -> Option<&str> {
+        self.user.as_deref()
    }

    /// Sets the password to authenticate with.
@@ -144,26 +237,40 @@ impl Config {
    ///
    /// Defaults to the user.
    pub fn dbname(&mut self, dbname: &str) -> &mut Config {
-        self.set_param("database", dbname)
+        self.dbname = Some(dbname.to_string());
+        self
    }

    /// Gets the name of the database to connect to, if one has been configured
    /// with the `dbname` method.
-    pub fn db_is_set(&self) -> bool {
-        self.database
+    pub fn get_dbname(&self) -> Option<&str> {
+        self.dbname.as_deref()
    }

-    pub fn set_param(&mut self, name: &str, value: &str) -> &mut Config {
-        if name == "database" {
-            self.database = true;
-        } else if name == "user" {
-            self.username = true;
-        }
-
-        self.server_params.insert(name, value);
+    /// Sets command line options used to configure the server.
+    pub fn options(&mut self, options: &str) -> &mut Config {
+        self.options = Some(options.to_string());
        self
    }

+    /// Gets the command line options used to configure the server, if the
+    /// options have been set with the `options` method.
+    pub fn get_options(&self) -> Option<&str> {
+        self.options.as_deref()
+    }
+
+    /// Sets the value of the `application_name` runtime parameter.
+    pub fn application_name(&mut self, application_name: &str) -> &mut Config {
+        self.application_name = Some(application_name.to_string());
+        self
+    }
+
+    /// Gets the value of the `application_name` runtime parameter, if it has
+    /// been set with the `application_name` method.
+    pub fn get_application_name(&self) -> Option<&str> {
+        self.application_name.as_deref()
+    }
+
    /// Sets the SSL configuration.
    ///
    /// Defaults to `prefer`.
@@ -177,14 +284,32 @@ impl Config {
        self.ssl_mode
    }

+    /// Adds a host to the configuration.
+    ///
+    /// Multiple hosts can be specified by calling this method multiple times, and each will be tried in order.
+    pub fn host(&mut self, host: &str) -> &mut Config {
+        self.host.push(Host::Tcp(host.to_string()));
+        self
+    }
+
    /// Gets the hosts that have been added to the configuration with `host`.
-    pub fn get_host(&self) -> &Host {
+    pub fn get_hosts(&self) -> &[Host] {
        &self.host
    }

+    /// Adds a port to the configuration.
+    ///
+    /// Multiple ports can be specified by calling this method multiple times. There must either be no ports, in which
+    /// case the default of 5432 is used, a single port, in which it is used for all hosts, or the same number of ports
+    /// as hosts.
+    pub fn port(&mut self, port: u16) -> &mut Config {
+        self.port.push(port);
+        self
+    }
+
    /// Gets the ports that have been added to the configuration with `port`.
-    pub fn get_port(&self) -> u16 {
-        self.port
+    pub fn get_ports(&self) -> &[u16] {
+        &self.port
    }

    /// Sets the timeout applied to socket-level connection attempts.
@@ -202,6 +327,23 @@ impl Config {
        self.connect_timeout.as_ref()
    }

+    /// Sets the requirements of the session.
+    ///
+    /// This can be used to connect to the primary server in a clustered database rather than one of the read-only
+    /// secondary servers. Defaults to `Any`.
+    pub fn target_session_attrs(
+        &mut self,
+        target_session_attrs: TargetSessionAttrs,
+    ) -> &mut Config {
+        self.target_session_attrs = target_session_attrs;
+        self
+    }
+
+    /// Gets the requirements of the session.
+    pub fn get_target_session_attrs(&self) -> TargetSessionAttrs {
+        self.target_session_attrs
+    }
+
    /// Sets the channel binding behavior.
    ///
    /// Defaults to `prefer`.
@@ -215,6 +357,121 @@ impl Config {
        self.channel_binding
    }

+    /// Set replication mode.
+    pub fn replication_mode(&mut self, replication_mode: ReplicationMode) -> &mut Config {
+        self.replication_mode = Some(replication_mode);
+        self
+    }
+
+    /// Get replication mode.
+    pub fn get_replication_mode(&self) -> Option<ReplicationMode> {
+        self.replication_mode
+    }
+
+    /// Set limit for backend messages size.
+    pub fn max_backend_message_size(&mut self, max_backend_message_size: usize) -> &mut Config {
+        self.max_backend_message_size = Some(max_backend_message_size);
+        self
+    }
+
+    /// Get limit for backend messages size.
+    pub fn get_max_backend_message_size(&self) -> Option<usize> {
+        self.max_backend_message_size
+    }
+
+    fn param(&mut self, key: &str, value: &str) -> Result<(), Error> {
+        match key {
+            "user" => {
+                self.user(value);
+            }
+            "password" => {
+                self.password(value);
+            }
+            "dbname" => {
+                self.dbname(value);
+            }
+            "options" => {
+                self.options(value);
+            }
+            "application_name" => {
+                self.application_name(value);
+            }
+            "sslmode" => {
+                let mode = match value {
+                    "disable" => SslMode::Disable,
+                    "prefer" => SslMode::Prefer,
+                    "require" => SslMode::Require,
+                    _ => return Err(Error::config_parse(Box::new(InvalidValue("sslmode")))),
+                };
+                self.ssl_mode(mode);
+            }
+            "host" => {
+                for host in value.split(',') {
+                    self.host(host);
+                }
+            }
+            "port" => {
+                for port in value.split(',') {
+                    let port = if port.is_empty() {
+                        5432
+                    } else {
+                        port.parse()
+                            .map_err(|_| Error::config_parse(Box::new(InvalidValue("port"))))?
+                    };
+                    self.port(port);
+                }
+            }
+            "connect_timeout" => {
+                let timeout = value
+                    .parse::<i64>()
+                    .map_err(|_| Error::config_parse(Box::new(InvalidValue("connect_timeout"))))?;
+                if timeout > 0 {
+                    self.connect_timeout(Duration::from_secs(timeout as u64));
+                }
+            }
+            "target_session_attrs" => {
+                let target_session_attrs = match value {
+                    "any" => TargetSessionAttrs::Any,
+                    "read-write" => TargetSessionAttrs::ReadWrite,
+                    _ => {
+                        return Err(Error::config_parse(Box::new(InvalidValue(
+                            "target_session_attrs",
+                        ))));
+                    }
+                };
+                self.target_session_attrs(target_session_attrs);
+            }
+            "channel_binding" => {
+                let channel_binding = match value {
+                    "disable" => ChannelBinding::Disable,
+                    "prefer" => ChannelBinding::Prefer,
+                    "require" => ChannelBinding::Require,
+                    _ => {
+                        return Err(Error::config_parse(Box::new(InvalidValue(
+                            "channel_binding",
+                        ))))
+                    }
+                };
+                self.channel_binding(channel_binding);
+            }
+            "max_backend_message_size" => {
+                let limit = value.parse::<usize>().map_err(|_| {
+                    Error::config_parse(Box::new(InvalidValue("max_backend_message_size")))
+                })?;
+                if limit > 0 {
+                    self.max_backend_message_size(limit);
+                }
+            }
+            key => {
+                return Err(Error::config_parse(Box::new(UnknownOption(
+                    key.to_string(),
+                ))));
+            }
+        }
+
+        Ok(())
+    }
+
    /// Opens a connection to a PostgreSQL database.
    ///
    /// Requires the `runtime` Cargo feature (enabled by default).
@@ -228,11 +485,14 @@ impl Config {
        connect(tls, self).await
    }

+    /// Connects to a PostgreSQL database over an arbitrary stream.
+    ///
+    /// All of the settings other than `user`, `password`, `dbname`, `options`, and `application_name` name are ignored.
    pub async fn connect_raw<S, T>(
        &self,
        stream: S,
        tls: T,
-    ) -> Result<RawConnection<S, T::Stream>, Error>
+    ) -> Result<(Client, Connection<S, T::Stream>), Error>
    where
        S: AsyncRead + AsyncWrite + Unpin,
        T: TlsConnect<S>,
@@ -241,6 +501,17 @@ impl Config {
    }
 }

+impl FromStr for Config {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Config, Error> {
+        match UrlParser::parse(s)? {
+            Some(config) => Ok(config),
+            None => Parser::parse(s),
+        }
+    }
+}
+
 // Omit password from debug output
 impl fmt::Debug for Config {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -252,13 +523,375 @@ impl fmt::Debug for Config {
        }

        f.debug_struct("Config")
+            .field("user", &self.user)
            .field("password", &self.password.as_ref().map(|_| Redaction {}))
+            .field("dbname", &self.dbname)
+            .field("options", &self.options)
+            .field("application_name", &self.application_name)
            .field("ssl_mode", &self.ssl_mode)
            .field("host", &self.host)
            .field("port", &self.port)
            .field("connect_timeout", &self.connect_timeout)
+            .field("target_session_attrs", &self.target_session_attrs)
            .field("channel_binding", &self.channel_binding)
-            .field("server_params", &self.server_params)
+            .field("replication", &self.replication_mode)
            .finish()
    }
 }
+
+#[derive(Debug)]
+struct UnknownOption(String);
+
+impl fmt::Display for UnknownOption {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "unknown option `{}`", self.0)
+    }
+}
+
+impl error::Error for UnknownOption {}
+
+#[derive(Debug)]
+struct InvalidValue(&'static str);
+
+impl fmt::Display for InvalidValue {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "invalid value for option `{}`", self.0)
+    }
+}
+
+impl error::Error for InvalidValue {}
+
+struct Parser<'a> {
+    s: &'a str,
+    it: iter::Peekable<str::CharIndices<'a>>,
+}
+
+impl<'a> Parser<'a> {
+    fn parse(s: &'a str) -> Result<Config, Error> {
+        let mut parser = Parser {
+            s,
+            it: s.char_indices().peekable(),
+        };
+
+        let mut config = Config::new();
+
+        while let Some((key, value)) = parser.parameter()? {
+            config.param(key, &value)?;
+        }
+
+        Ok(config)
+    }
+
+    fn skip_ws(&mut self) {
+        self.take_while(char::is_whitespace);
+    }
+
+    fn take_while<F>(&mut self, f: F) -> &'a str
+    where
+        F: Fn(char) -> bool,
+    {
+        let start = match self.it.peek() {
+            Some(&(i, _)) => i,
+            None => return "",
+        };
+
+        loop {
+            match self.it.peek() {
+                Some(&(_, c)) if f(c) => {
+                    self.it.next();
+                }
+                Some(&(i, _)) => return &self.s[start..i],
+                None => return &self.s[start..],
+            }
+        }
+    }
+
+    fn eat(&mut self, target: char) -> Result<(), Error> {
+        match self.it.next() {
+            Some((_, c)) if c == target => Ok(()),
+            Some((i, c)) => {
+                let m = format!(
+                    "unexpected character at byte {}: expected `{}` but got `{}`",
+                    i, target, c
+                );
+                Err(Error::config_parse(m.into()))
+            }
+            None => Err(Error::config_parse("unexpected EOF".into())),
+        }
+    }
+
+    fn eat_if(&mut self, target: char) -> bool {
+        match self.it.peek() {
+            Some(&(_, c)) if c == target => {
+                self.it.next();
+                true
+            }
+            _ => false,
+        }
+    }
+
+    fn keyword(&mut self) -> Option<&'a str> {
+        let s = self.take_while(|c| match c {
+            c if c.is_whitespace() => false,
+            '=' => false,
+            _ => true,
+        });
+
+        if s.is_empty() {
+            None
+        } else {
+            Some(s)
+        }
+    }
+
+    fn value(&mut self) -> Result<String, Error> {
+        let value = if self.eat_if('\'') {
+            let value = self.quoted_value()?;
+            self.eat('\'')?;
+            value
+        } else {
+            self.simple_value()?
+        };
+
+        Ok(value)
+    }
+
+    fn simple_value(&mut self) -> Result<String, Error> {
+        let mut value = String::new();
+
+        while let Some(&(_, c)) = self.it.peek() {
+            if c.is_whitespace() {
+                break;
+            }
+
+            self.it.next();
+            if c == '\\' {
+                if let Some((_, c2)) = self.it.next() {
+                    value.push(c2);
+                }
+            } else {
+                value.push(c);
+            }
+        }
+
+        if value.is_empty() {
+            return Err(Error::config_parse("unexpected EOF".into()));
+        }
+
+        Ok(value)
+    }
+
+    fn quoted_value(&mut self) -> Result<String, Error> {
+        let mut value = String::new();
+
+        while let Some(&(_, c)) = self.it.peek() {
+            if c == '\'' {
+                return Ok(value);
+            }
+
+            self.it.next();
+            if c == '\\' {
+                if let Some((_, c2)) = self.it.next() {
+                    value.push(c2);
+                }
+            } else {
+                value.push(c);
+            }
+        }
+
+        Err(Error::config_parse(
+            "unterminated quoted connection parameter value".into(),
+        ))
+    }
+
+    fn parameter(&mut self) -> Result<Option<(&'a str, String)>, Error> {
+        self.skip_ws();
+        let keyword = match self.keyword() {
+            Some(keyword) => keyword,
+            None => return Ok(None),
+        };
+        self.skip_ws();
+        self.eat('=')?;
+        self.skip_ws();
+        let value = self.value()?;
+
+        Ok(Some((keyword, value)))
+    }
+}
+
+// This is a pretty sloppy "URL" parser, but it matches the behavior of libpq, where things really aren't very strict
+struct UrlParser<'a> {
+    s: &'a str,
+    config: Config,
+}
+
+impl<'a> UrlParser<'a> {
+    fn parse(s: &'a str) -> Result<Option<Config>, Error> {
+        let s = match Self::remove_url_prefix(s) {
+            Some(s) => s,
+            None => return Ok(None),
+        };
+
+        let mut parser = UrlParser {
+            s,
+            config: Config::new(),
+        };
+
+        parser.parse_credentials()?;
+        parser.parse_host()?;
+        parser.parse_path()?;
+        parser.parse_params()?;
+
+        Ok(Some(parser.config))
+    }
+
+    fn remove_url_prefix(s: &str) -> Option<&str> {
+        for prefix in &["postgres://", "postgresql://"] {
+            if let Some(stripped) = s.strip_prefix(prefix) {
+                return Some(stripped);
+            }
+        }
+
+        None
+    }
+
+    fn take_until(&mut self, end: &[char]) -> Option<&'a str> {
+        match self.s.find(end) {
+            Some(pos) => {
+                let (head, tail) = self.s.split_at(pos);
+                self.s = tail;
+                Some(head)
+            }
+            None => None,
+        }
+    }
+
+    fn take_all(&mut self) -> &'a str {
+        mem::take(&mut self.s)
+    }
+
+    fn eat_byte(&mut self) {
+        self.s = &self.s[1..];
+    }
+
+    fn parse_credentials(&mut self) -> Result<(), Error> {
+        let creds = match self.take_until(&['@']) {
+            Some(creds) => creds,
+            None => return Ok(()),
+        };
+        self.eat_byte();
+
+        let mut it = creds.splitn(2, ':');
+        let user = self.decode(it.next().unwrap())?;
+        self.config.user(&user);
+
+        if let Some(password) = it.next() {
+            let password = Cow::from(percent_encoding::percent_decode(password.as_bytes()));
+            self.config.password(password);
+        }
+
+        Ok(())
+    }
+
+    fn parse_host(&mut self) -> Result<(), Error> {
+        let host = match self.take_until(&['/', '?']) {
+            Some(host) => host,
+            None => self.take_all(),
+        };
+
+        if host.is_empty() {
+            return Ok(());
+        }
+
+        for chunk in host.split(',') {
+            let (host, port) = if chunk.starts_with('[') {
+                let idx = match chunk.find(']') {
+                    Some(idx) => idx,
+                    None => return Err(Error::config_parse(InvalidValue("host").into())),
+                };
+
+                let host = &chunk[1..idx];
+                let remaining = &chunk[idx + 1..];
+                let port = if let Some(port) = remaining.strip_prefix(':') {
+                    Some(port)
+                } else if remaining.is_empty() {
+                    None
+                } else {
+                    return Err(Error::config_parse(InvalidValue("host").into()));
+                };
+
+                (host, port)
+            } else {
+                let mut it = chunk.splitn(2, ':');
+                (it.next().unwrap(), it.next())
+            };
+
+            self.host_param(host)?;
+            let port = self.decode(port.unwrap_or("5432"))?;
+            self.config.param("port", &port)?;
+        }
+
+        Ok(())
+    }
+
+    fn parse_path(&mut self) -> Result<(), Error> {
+        if !self.s.starts_with('/') {
+            return Ok(());
+        }
+        self.eat_byte();
+
+        let dbname = match self.take_until(&['?']) {
+            Some(dbname) => dbname,
+            None => self.take_all(),
+        };
+
+        if !dbname.is_empty() {
+            self.config.dbname(&self.decode(dbname)?);
+        }
+
+        Ok(())
+    }
+
+    fn parse_params(&mut self) -> Result<(), Error> {
+        if !self.s.starts_with('?') {
+            return Ok(());
+        }
+        self.eat_byte();
+
+        while !self.s.is_empty() {
+            let key = match self.take_until(&['=']) {
+                Some(key) => self.decode(key)?,
+                None => return Err(Error::config_parse("unterminated parameter".into())),
+            };
+            self.eat_byte();
+
+            let value = match self.take_until(&['&']) {
+                Some(value) => {
+                    self.eat_byte();
+                    value
+                }
+                None => self.take_all(),
+            };
+
+            if key == "host" {
+                self.host_param(value)?;
+            } else {
+                let value = self.decode(value)?;
+                self.config.param(&key, &value)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn host_param(&mut self, s: &str) -> Result<(), Error> {
+        let s = self.decode(s)?;
+        self.config.param("host", &s)
+    }
+
+    fn decode(&self, s: &'a str) -> Result<Cow<'a, str>, Error> {
+        percent_encoding::percent_decode(s.as_bytes())
+            .decode_utf8()
+            .map_err(|e| Error::config_parse(e.into()))
+    }
+}
--- a/libs/proxy/tokio-postgres2/src/connect.rs
+++ b/libs/proxy/tokio-postgres2/src/connect.rs
@@ -1,13 +1,13 @@
 use crate::client::SocketConfig;
-use crate::codec::BackendMessage;
-use crate::config::Host;
+use crate::config::{Host, TargetSessionAttrs};
 use crate::connect_raw::connect_raw;
 use crate::connect_socket::connect_socket;
 use crate::tls::{MakeTlsConnect, TlsConnect};
-use crate::{Client, Config, Connection, Error, RawConnection};
-use postgres_protocol2::message::backend::Message;
+use crate::{Client, Config, Connection, Error, SimpleQueryMessage};
+use futures_util::{future, pin_mut, Future, FutureExt, Stream};
+use std::io;
+use std::task::Poll;
 use tokio::net::TcpStream;
-use tokio::sync::mpsc;

 pub async fn connect<T>(
    mut tls: T,
@@ -16,18 +16,38 @@ pub async fn connect<T>(
 where
    T: MakeTlsConnect<TcpStream>,
 {
-    let hostname = match &config.host {
-        Host::Tcp(host) => host.as_str(),
-    };
-
-    let tls = tls
-        .make_tls_connect(hostname)
-        .map_err(|e| Error::tls(e.into()))?;
-
-    match connect_once(&config.host, config.port, tls, config).await {
-        Ok((client, connection)) => Ok((client, connection)),
-        Err(e) => Err(e),
+    if config.host.is_empty() {
+        return Err(Error::config("host missing".into()));
    }
+
+    if config.port.len() > 1 && config.port.len() != config.host.len() {
+        return Err(Error::config("invalid number of ports".into()));
+    }
+
+    let mut error = None;
+    for (i, host) in config.host.iter().enumerate() {
+        let port = config
+            .port
+            .get(i)
+            .or_else(|| config.port.first())
+            .copied()
+            .unwrap_or(5432);
+
+        let hostname = match host {
+            Host::Tcp(host) => host.as_str(),
+        };
+
+        let tls = tls
+            .make_tls_connect(hostname)
+            .map_err(|e| Error::tls(e.into()))?;
+
+        match connect_once(host, port, tls, config).await {
+            Ok((client, connection)) => return Ok((client, connection)),
+            Err(e) => error = Some(e),
+        }
+    }
+
+    Err(error.unwrap())
 }

 async fn connect_once<T>(
@@ -40,36 +60,53 @@ where
    T: TlsConnect<TcpStream>,
 {
    let socket = connect_socket(host, port, config.connect_timeout).await?;
-    let RawConnection {
-        stream,
-        parameters,
-        delayed_notice,
-        process_id,
-        secret_key,
-    } = connect_raw(socket, tls, config).await?;
+    let (mut client, mut connection) = connect_raw(socket, tls, config).await?;

-    let socket_config = SocketConfig {
+    if let TargetSessionAttrs::ReadWrite = config.target_session_attrs {
+        let rows = client.simple_query_raw("SHOW transaction_read_only");
+        pin_mut!(rows);
+
+        let rows = future::poll_fn(|cx| {
+            if connection.poll_unpin(cx)?.is_ready() {
+                return Poll::Ready(Err(Error::closed()));
+            }
+
+            rows.as_mut().poll(cx)
+        })
+        .await?;
+        pin_mut!(rows);
+
+        loop {
+            let next = future::poll_fn(|cx| {
+                if connection.poll_unpin(cx)?.is_ready() {
+                    return Poll::Ready(Some(Err(Error::closed())));
+                }
+
+                rows.as_mut().poll_next(cx)
+            });
+
+            match next.await.transpose()? {
+                Some(SimpleQueryMessage::Row(row)) => {
+                    if row.try_get(0)? == Some("on") {
+                        return Err(Error::connect(io::Error::new(
+                            io::ErrorKind::PermissionDenied,
+                            "database does not allow writes",
+                        )));
+                    } else {
+                        break;
+                    }
+                }
+                Some(_) => {}
+                None => return Err(Error::unexpected_message()),
+            }
+        }
+    }
+
+    client.set_socket_config(SocketConfig {
        host: host.clone(),
        port,
        connect_timeout: config.connect_timeout,
-    };
-
-    let (sender, receiver) = mpsc::unbounded_channel();
-    let client = Client::new(
-        sender,
-        socket_config,
-        config.ssl_mode,
-        process_id,
-        secret_key,
-    );
-
-    // delayed notices are always sent as "Async" messages.
-    let delayed = delayed_notice
-        .into_iter()
-        .map(|m| BackendMessage::Async(Message::NoticeResponse(m)))
-        .collect();
-
-    let connection = Connection::new(stream, delayed, parameters, receiver);
+    });

    Ok((client, connection))
 }
--- a/libs/proxy/tokio-postgres2/src/connect_raw.rs
+++ b/libs/proxy/tokio-postgres2/src/connect_raw.rs
@@ -1,27 +1,29 @@
 use crate::codec::{BackendMessage, BackendMessages, FrontendMessage, PostgresCodec};
-use crate::config::{self, AuthKeys, Config};
+use crate::config::{self, AuthKeys, Config, ReplicationMode};
 use crate::connect_tls::connect_tls;
 use crate::maybe_tls_stream::MaybeTlsStream;
 use crate::tls::{TlsConnect, TlsStream};
-use crate::Error;
+use crate::{Client, Connection, Error};
 use bytes::BytesMut;
 use fallible_iterator::FallibleIterator;
 use futures_util::{ready, Sink, SinkExt, Stream, TryStreamExt};
+use postgres_protocol2::authentication;
 use postgres_protocol2::authentication::sasl;
 use postgres_protocol2::authentication::sasl::ScramSha256;
-use postgres_protocol2::message::backend::{AuthenticationSaslBody, Message, NoticeResponseBody};
+use postgres_protocol2::message::backend::{AuthenticationSaslBody, Message};
 use postgres_protocol2::message::frontend;
-use std::collections::HashMap;
+use std::collections::{HashMap, VecDeque};
 use std::io;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 use tokio::io::{AsyncRead, AsyncWrite};
+use tokio::sync::mpsc;
 use tokio_util::codec::Framed;

 pub struct StartupStream<S, T> {
    inner: Framed<MaybeTlsStream<S, T>, PostgresCodec>,
    buf: BackendMessages,
-    delayed_notice: Vec<NoticeResponseBody>,
+    delayed: VecDeque<BackendMessage>,
 }

 impl<S, T> Sink<FrontendMessage> for StartupStream<S, T>
@@ -76,19 +78,11 @@ where
    }
 }

-pub struct RawConnection<S, T> {
-    pub stream: Framed<MaybeTlsStream<S, T>, PostgresCodec>,
-    pub parameters: HashMap<String, String>,
-    pub delayed_notice: Vec<NoticeResponseBody>,
-    pub process_id: i32,
-    pub secret_key: i32,
-}
-
 pub async fn connect_raw<S, T>(
    stream: S,
    tls: T,
    config: &Config,
-) -> Result<RawConnection<S, T::Stream>, Error>
+) -> Result<(Client, Connection<S, T::Stream>), Error>
 where
    S: AsyncRead + AsyncWrite + Unpin,
    T: TlsConnect<S>,
@@ -96,22 +90,25 @@ where
    let stream = connect_tls(stream, config.ssl_mode, tls).await?;

    let mut stream = StartupStream {
-        inner: Framed::new(stream, PostgresCodec),
+        inner: Framed::new(
+            stream,
+            PostgresCodec {
+                max_message_size: config.max_backend_message_size,
+            },
+        ),
        buf: BackendMessages::empty(),
-        delayed_notice: Vec::new(),
+        delayed: VecDeque::new(),
    };

    startup(&mut stream, config).await?;
    authenticate(&mut stream, config).await?;
    let (process_id, secret_key, parameters) = read_info(&mut stream).await?;

-    Ok(RawConnection {
-        stream: stream.inner,
-        parameters,
-        delayed_notice: stream.delayed_notice,
-        process_id,
-        secret_key,
-    })
+    let (sender, receiver) = mpsc::unbounded_channel();
+    let client = Client::new(sender, config.ssl_mode, process_id, secret_key);
+    let connection = Connection::new(stream.inner, stream.delayed, parameters, receiver);
+
+    Ok((client, connection))
 }

 async fn startup<S, T>(stream: &mut StartupStream<S, T>, config: &Config) -> Result<(), Error>
@@ -119,8 +116,28 @@ where
    S: AsyncRead + AsyncWrite + Unpin,
    T: AsyncRead + AsyncWrite + Unpin,
 {
+    let mut params = vec![("client_encoding", "UTF8")];
+    if let Some(user) = &config.user {
+        params.push(("user", &**user));
+    }
+    if let Some(dbname) = &config.dbname {
+        params.push(("database", &**dbname));
+    }
+    if let Some(options) = &config.options {
+        params.push(("options", &**options));
+    }
+    if let Some(application_name) = &config.application_name {
+        params.push(("application_name", &**application_name));
+    }
+    if let Some(replication_mode) = &config.replication_mode {
+        match replication_mode {
+            ReplicationMode::Physical => params.push(("replication", "true")),
+            ReplicationMode::Logical => params.push(("replication", "database")),
+        }
+    }
+
    let mut buf = BytesMut::new();
-    frontend::startup_message(&config.server_params, &mut buf).map_err(Error::encode)?;
+    frontend::startup_message(params, &mut buf).map_err(Error::encode)?;

    stream
        .send(FrontendMessage::Raw(buf.freeze()))
@@ -148,11 +165,25 @@ where

            authenticate_password(stream, pass).await?;
        }
+        Some(Message::AuthenticationMd5Password(body)) => {
+            can_skip_channel_binding(config)?;
+
+            let user = config
+                .user
+                .as_ref()
+                .ok_or_else(|| Error::config("user missing".into()))?;
+            let pass = config
+                .password
+                .as_ref()
+                .ok_or_else(|| Error::config("password missing".into()))?;
+
+            let output = authentication::md5_hash(user.as_bytes(), pass, body.salt());
+            authenticate_password(stream, output.as_bytes()).await?;
+        }
        Some(Message::AuthenticationSasl(body)) => {
            authenticate_sasl(stream, body, config).await?;
        }
-        Some(Message::AuthenticationMd5Password)
-        | Some(Message::AuthenticationKerberosV5)
+        Some(Message::AuthenticationKerberosV5)
        | Some(Message::AuthenticationScmCredential)
        | Some(Message::AuthenticationGss)
        | Some(Message::AuthenticationSspi) => {
@@ -316,7 +347,9 @@ where
                    body.value().map_err(Error::parse)?.to_string(),
                );
            }
-            Some(Message::NoticeResponse(body)) => stream.delayed_notice.push(body),
+            Some(msg @ Message::NoticeResponse(_)) => {
+                stream.delayed.push_back(BackendMessage::Async(msg))
+            }
            Some(Message::ReadyForQuery(_)) => return Ok((process_id, secret_key, parameters)),
            Some(Message::ErrorResponse(body)) => return Err(Error::db(body)),
            Some(_) => return Err(Error::unexpected_message()),
--- a/libs/proxy/tokio-postgres2/src/error/mod.rs
+++ b/libs/proxy/tokio-postgres2/src/error/mod.rs
@@ -349,6 +349,7 @@ enum Kind {
    Parse,
    Encode,
    Authentication,
+    ConfigParse,
    Config,
    Connect,
    Timeout,
@@ -385,6 +386,7 @@ impl fmt::Display for Error {
            Kind::Parse => fmt.write_str("error parsing response from server")?,
            Kind::Encode => fmt.write_str("error encoding message to server")?,
            Kind::Authentication => fmt.write_str("authentication error")?,
+            Kind::ConfigParse => fmt.write_str("invalid connection string")?,
            Kind::Config => fmt.write_str("invalid configuration")?,
            Kind::Connect => fmt.write_str("error connecting to server")?,
            Kind::Timeout => fmt.write_str("timeout waiting for server")?,
@@ -480,6 +482,10 @@ impl Error {
        Error::new(Kind::Authentication, Some(e))
    }

+    pub(crate) fn config_parse(e: Box<dyn error::Error + Sync + Send>) -> Error {
+        Error::new(Kind::ConfigParse, Some(e))
+    }
+
    pub(crate) fn config(e: Box<dyn error::Error + Sync + Send>) -> Error {
        Error::new(Kind::Config, Some(e))
    }
--- a/libs/proxy/tokio-postgres2/src/lib.rs
+++ b/libs/proxy/tokio-postgres2/src/lib.rs
@@ -1,10 +1,9 @@
 //! An asynchronous, pipelined, PostgreSQL client.
-#![warn(rust_2018_idioms, clippy::all)]
+#![warn(rust_2018_idioms, clippy::all, missing_docs)]

 pub use crate::cancel_token::CancelToken;
-pub use crate::client::{Client, SocketConfig};
+pub use crate::client::Client;
 pub use crate::config::Config;
-pub use crate::connect_raw::RawConnection;
 pub use crate::connection::Connection;
 use crate::error::DbError;
 pub use crate::error::Error;
@@ -13,12 +12,14 @@ pub use crate::query::RowStream;
 pub use crate::row::{Row, SimpleQueryRow};
 pub use crate::simple_query::SimpleQueryStream;
 pub use crate::statement::{Column, Statement};
+use crate::tls::MakeTlsConnect;
 pub use crate::tls::NoTls;
 pub use crate::to_statement::ToStatement;
 pub use crate::transaction::Transaction;
 pub use crate::transaction_builder::{IsolationLevel, TransactionBuilder};
 use crate::types::ToSql;
 use postgres_protocol2::message::backend::ReadyForQueryBody;
+use tokio::net::TcpStream;

 /// After executing a query, the connection will be in one of these states
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -70,6 +71,24 @@ mod transaction;
 mod transaction_builder;
 pub mod types;

+/// A convenience function which parses a connection string and connects to the database.
+///
+/// See the documentation for [`Config`] for details on the connection string format.
+///
+/// Requires the `runtime` Cargo feature (enabled by default).
+///
+/// [`Config`]: config/struct.Config.html
+pub async fn connect<T>(
+    config: &str,
+    tls: T,
+) -> Result<(Client, Connection<TcpStream, T::Stream>), Error>
+where
+    T: MakeTlsConnect<TcpStream>,
+{
+    let config = config.parse::<Config>()?;
+    config.connect(tls).await
+}
+
 /// An asynchronous notification.
 #[derive(Clone, Debug)]
 pub struct Notification {
--- a/libs/utils/Cargo.toml
+++ b/libs/utils/Cargo.toml
@@ -26,7 +26,6 @@ humantime.workspace = true
 hyper0 = { workspace = true, features = ["full"] }
 fail.workspace = true
 futures = { workspace = true}
-jemalloc_pprof.workspace = true
 jsonwebtoken.workspace = true
 nix.workspace = true
 once_cell.workspace = true
--- a/libs/utils/src/http/endpoint.rs
+++ b/libs/utils/src/http/endpoint.rs
@@ -10,7 +10,6 @@ use metrics::{register_int_counter, Encoder, IntCounter, TextEncoder};
 use once_cell::sync::Lazy;
 use routerify::ext::RequestExt;
 use routerify::{Middleware, RequestInfo, Router, RouterBuilder};
-use tokio_util::io::ReaderStream;
 use tracing::{debug, info, info_span, warn, Instrument};

 use std::future::Future;
@@ -408,69 +407,6 @@ pub async fn profile_cpu_handler(req: Request<Body>) -> Result<Response<Body>, A
    }
 }

-/// Generates heap profiles.
-///
-/// This only works with jemalloc on Linux.
-pub async fn profile_heap_handler(req: Request<Body>) -> Result<Response<Body>, ApiError> {
-    enum Format {
-        Jemalloc,
-        Pprof,
-    }
-
-    // Parameters.
-    let format = match get_query_param(&req, "format")?.as_deref() {
-        None => Format::Pprof,
-        Some("jemalloc") => Format::Jemalloc,
-        Some("pprof") => Format::Pprof,
-        Some(format) => return Err(ApiError::BadRequest(anyhow!("invalid format {format}"))),
-    };
-
-    // Obtain profiler handle.
-    let mut prof_ctl = jemalloc_pprof::PROF_CTL
-        .as_ref()
-        .ok_or(ApiError::InternalServerError(anyhow!(
-            "heap profiling not enabled"
-        )))?
-        .lock()
-        .await;
-    if !prof_ctl.activated() {
-        return Err(ApiError::InternalServerError(anyhow!(
-            "heap profiling not enabled"
-        )));
-    }
-
-    // Take and return the profile.
-    match format {
-        Format::Jemalloc => {
-            // NB: file is an open handle to a tempfile that's already deleted.
-            let file = tokio::task::spawn_blocking(move || prof_ctl.dump())
-                .await
-                .map_err(|join_err| ApiError::InternalServerError(join_err.into()))?
-                .map_err(ApiError::InternalServerError)?;
-            let stream = ReaderStream::new(tokio::fs::File::from_std(file));
-            Response::builder()
-                .status(200)
-                .header(CONTENT_TYPE, "application/octet-stream")
-                .header(CONTENT_DISPOSITION, "attachment; filename=\"heap.dump\"")
-                .body(Body::wrap_stream(stream))
-                .map_err(|err| ApiError::InternalServerError(err.into()))
-        }
-
-        Format::Pprof => {
-            let data = tokio::task::spawn_blocking(move || prof_ctl.dump_pprof())
-                .await
-                .map_err(|join_err| ApiError::InternalServerError(join_err.into()))?
-                .map_err(ApiError::InternalServerError)?;
-            Response::builder()
-                .status(200)
-                .header(CONTENT_TYPE, "application/octet-stream")
-                .header(CONTENT_DISPOSITION, "attachment; filename=\"heap.pb\"")
-                .body(Body::from(data))
-                .map_err(|err| ApiError::InternalServerError(err.into()))
-        }
-    }
-}
-
 pub fn add_request_id_middleware<B: hyper::body::HttpBody + Send + Sync + 'static>(
 ) -> Middleware<B, ApiError> {
    Middleware::pre(move |req| async move {
--- a/libs/utils/src/sync.rs
+++ b/libs/utils/src/sync.rs
@@ -1,6 +1,5 @@
 pub mod heavier_once_cell;

-pub mod duplex;
 pub mod gate;

 pub mod spsc_fold;
--- a/libs/utils/src/sync/duplex.rs
+++ b/libs/utils/src/sync/duplex.rs
@@ -1 +0,0 @@
-pub mod mpsc;
--- a/libs/utils/src/sync/duplex/mpsc.rs
+++ b/libs/utils/src/sync/duplex/mpsc.rs
@@ -1,36 +0,0 @@
-use tokio::sync::mpsc;
-
-/// A bi-directional channel.
-pub struct Duplex<S, R> {
-    pub tx: mpsc::Sender<S>,
-    pub rx: mpsc::Receiver<R>,
-}
-
-/// Creates a bi-directional channel.
-///
-/// The channel will buffer up to the provided number of messages. Once the buffer is full,
-/// attempts to send new messages will wait until a message is received from the channel.
-/// The provided buffer capacity must be at least 1.
-pub fn channel<A: Send, B: Send>(buffer: usize) -> (Duplex<A, B>, Duplex<B, A>) {
-    let (tx_a, rx_a) = mpsc::channel::<A>(buffer);
-    let (tx_b, rx_b) = mpsc::channel::<B>(buffer);
-
-    (Duplex { tx: tx_a, rx: rx_b }, Duplex { tx: tx_b, rx: rx_a })
-}
-
-impl<S: Send, R: Send> Duplex<S, R> {
-    /// Sends a value, waiting until there is capacity.
-    ///
-    /// A successful send occurs when it is determined that the other end of the channel has not hung up already.
-    pub async fn send(&self, x: S) -> Result<(), mpsc::error::SendError<S>> {
-        self.tx.send(x).await
-    }
-
-    /// Receives the next value for this receiver.
-    ///
-    /// This method returns `None` if the channel has been closed and there are
-    /// no remaining messages in the channel's buffer.
-    pub async fn recv(&mut self) -> Option<R> {
-        self.rx.recv().await
-    }
-}
--- a/libs/wal_decoder/src/decoder.rs
+++ b/libs/wal_decoder/src/decoder.rs
@@ -112,38 +112,30 @@ impl MetadataRecord {
        };

        // Next, filter the metadata record by shard.
-        match metadata_record {
-            Some(
-                MetadataRecord::Heapam(HeapamRecord::ClearVmBits(ref mut clear_vm_bits))
-                | MetadataRecord::Neonrmgr(NeonrmgrRecord::ClearVmBits(ref mut clear_vm_bits)),
-            ) => {
-                // Route VM page updates to the shards that own them. VM pages are stored in the VM fork
-                // of the main relation. These are sharded and managed just like regular relation pages.
-                // See: https://github.com/neondatabase/neon/issues/9855
-                let is_local_vm_page = |heap_blk| {
-                    let vm_blk = pg_constants::HEAPBLK_TO_MAPBLOCK(heap_blk);
-                    shard.is_key_local(&rel_block_to_key(clear_vm_bits.vm_rel, vm_blk))
-                };
-                // Send the old and new VM page updates to their respective shards.
-                clear_vm_bits.old_heap_blkno = clear_vm_bits
-                    .old_heap_blkno
-                    .filter(|&blkno| is_local_vm_page(blkno));
-                clear_vm_bits.new_heap_blkno = clear_vm_bits
-                    .new_heap_blkno
-                    .filter(|&blkno| is_local_vm_page(blkno));
-                // If neither VM page belongs to this shard, discard the record.
-                if clear_vm_bits.old_heap_blkno.is_none() && clear_vm_bits.new_heap_blkno.is_none()
-                {
-                    metadata_record = None
-                }
+
+        // Route VM page updates to the shards that own them. VM pages are stored in the VM fork
+        // of the main relation. These are sharded and managed just like regular relation pages.
+        // See: https://github.com/neondatabase/neon/issues/9855
+        if let Some(
+            MetadataRecord::Heapam(HeapamRecord::ClearVmBits(ref mut clear_vm_bits))
+            | MetadataRecord::Neonrmgr(NeonrmgrRecord::ClearVmBits(ref mut clear_vm_bits)),
+        ) = metadata_record
+        {
+            let is_local_vm_page = |heap_blk| {
+                let vm_blk = pg_constants::HEAPBLK_TO_MAPBLOCK(heap_blk);
+                shard.is_key_local(&rel_block_to_key(clear_vm_bits.vm_rel, vm_blk))
+            };
+            // Send the old and new VM page updates to their respective shards.
+            clear_vm_bits.old_heap_blkno = clear_vm_bits
+                .old_heap_blkno
+                .filter(|&blkno| is_local_vm_page(blkno));
+            clear_vm_bits.new_heap_blkno = clear_vm_bits
+                .new_heap_blkno
+                .filter(|&blkno| is_local_vm_page(blkno));
+            // If neither VM page belongs to this shard, discard the record.
+            if clear_vm_bits.old_heap_blkno.is_none() && clear_vm_bits.new_heap_blkno.is_none() {
+                metadata_record = None
            }
-            Some(MetadataRecord::LogicalMessage(LogicalMessageRecord::Put(_))) => {
-                // Filter LogicalMessage records (AUX files) to only be stored on shard zero
-                if !shard.is_shard_zero() {
-                    metadata_record = None;
-                }
-            }
-            _ => {}
        }

        Ok(metadata_record)
--- a/pageserver/benches/bench_ingest.rs
+++ b/pageserver/benches/bench_ingest.rs
@@ -62,8 +62,10 @@ async fn ingest(
    let ctx = RequestContext::new(TaskKind::DebugTool, DownloadBehavior::Error);

    let gate = utils::sync::gate::Gate::default();
+    let entered = gate.enter().unwrap();

-    let layer = InMemoryLayer::create(conf, timeline_id, tenant_shard_id, lsn, &gate, &ctx).await?;
+    let layer =
+        InMemoryLayer::create(conf, timeline_id, tenant_shard_id, lsn, entered, &ctx).await?;

    let data = Value::Image(Bytes::from(vec![0u8; put_size]));
    let data_ser_size = data.serialized_size().unwrap() as usize;
--- a/pageserver/client/src/mgmt_api.rs
+++ b/pageserver/client/src/mgmt_api.rs
@@ -1,4 +1,4 @@
-use std::{collections::HashMap, error::Error as _};
+use std::collections::HashMap;

 use bytes::Bytes;
 use detach_ancestor::AncestorDetached;
@@ -25,10 +25,10 @@ pub struct Client {

 #[derive(thiserror::Error, Debug)]
 pub enum Error {
-    #[error("send request: {0}{}", .0.source().map(|e| format!(": {e}")).unwrap_or_default())]
+    #[error("send request: {0}")]
    SendRequest(reqwest::Error),

-    #[error("receive body: {0}{}", .0.source().map(|e| format!(": {e}")).unwrap_or_default())]
+    #[error("receive body: {0}")]
    ReceiveBody(reqwest::Error),

    #[error("receive error body: {0}")]
--- a/pageserver/src/bin/pageserver.rs
+++ b/pageserver/src/bin/pageserver.rs
@@ -53,11 +53,6 @@ project_build_tag!(BUILD_TAG);
 #[global_allocator]
 static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;

-/// Configure jemalloc to sample allocations for profiles every 1 MB (1 << 20).
-#[allow(non_upper_case_globals)]
-#[export_name = "malloc_conf"]
-pub static malloc_conf: &[u8] = b"prof:true,prof_active:true,lg_prof_sample:20\0";
-
 const PID_FILE_NAME: &str = "pageserver.pid";

 const FEATURES: &[&str] = &[
@@ -132,7 +127,6 @@ fn main() -> anyhow::Result<()> {
    info!(?conf.virtual_file_io_engine, "starting with virtual_file IO engine");
    info!(?conf.virtual_file_io_mode, "starting with virtual_file IO mode");
    info!(?conf.wal_receiver_protocol, "starting with WAL receiver protocol");
-    info!(?conf.page_service_pipelining, "starting with page service pipelining config");

    // The tenants directory contains all the pageserver local disk state.
    // Create if not exists and make sure all the contents are durable before proceeding.
@@ -308,7 +302,7 @@ fn start_pageserver(
        pageserver::metrics::tokio_epoll_uring::Collector::new(),
    ))
    .unwrap();
-    pageserver::preinitialize_metrics(conf);
+    pageserver::preinitialize_metrics();

    // If any failpoints were set from FAILPOINTS environment variable,
    // print them to the log for debugging purposes
@@ -636,59 +630,45 @@ fn start_pageserver(
        tokio::net::TcpListener::from_std(pageserver_listener).context("create tokio listener")?
    });

-    // All started up! Now just sit and wait for shutdown signal.
-    BACKGROUND_RUNTIME.block_on(async move {
-        let signal_token = CancellationToken::new();
-        let signal_cancel = signal_token.child_token();
+    let mut shutdown_pageserver = Some(shutdown_pageserver.drop_guard());

-        // Spawn signal handlers. Runs in a loop since we want to be responsive to multiple signals
-        // even after triggering shutdown (e.g. a SIGQUIT after a slow SIGTERM shutdown). See:
-        // https://github.com/neondatabase/neon/issues/9740.
-        tokio::spawn(async move {
+    // All started up! Now just sit and wait for shutdown signal.
+
+    {
+        BACKGROUND_RUNTIME.block_on(async move {
            let mut sigint = tokio::signal::unix::signal(SignalKind::interrupt()).unwrap();
            let mut sigterm = tokio::signal::unix::signal(SignalKind::terminate()).unwrap();
            let mut sigquit = tokio::signal::unix::signal(SignalKind::quit()).unwrap();
-
-            loop {
-                let signal = tokio::select! {
-                    _ = sigquit.recv() => {
-                        info!("Got signal SIGQUIT. Terminating in immediate shutdown mode.");
-                        std::process::exit(111);
-                    }
-                    _ = sigint.recv() => "SIGINT",
-                    _ = sigterm.recv() => "SIGTERM",
-                };
-
-                if !signal_token.is_cancelled() {
-                    info!("Got signal {signal}. Terminating gracefully in fast shutdown mode.");
-                    signal_token.cancel();
-                } else {
-                    info!("Got signal {signal}. Already shutting down.");
+            let signal = tokio::select! {
+                _ = sigquit.recv() => {
+                    info!("Got signal SIGQUIT. Terminating in immediate shutdown mode",);
+                    std::process::exit(111);
                }
-            }
-        });
+                _ = sigint.recv() => { "SIGINT" },
+                _ = sigterm.recv() => { "SIGTERM" },
+            };

-        // Wait for cancellation signal and shut down the pageserver.
-        //
-        // This cancels the `shutdown_pageserver` cancellation tree. Right now that tree doesn't
-        // reach very far, and `task_mgr` is used instead. The plan is to change that over time.
-        signal_cancel.cancelled().await;
+            info!("Got signal {signal}. Terminating gracefully in fast shutdown mode",);

-        shutdown_pageserver.cancel();
-        pageserver::shutdown_pageserver(
-            http_endpoint_listener,
-            page_service,
-            consumption_metrics_tasks,
-            disk_usage_eviction_task,
-            &tenant_manager,
-            background_purges,
-            deletion_queue.clone(),
-            secondary_controller_tasks,
-            0,
-        )
-        .await;
-        unreachable!();
-    })
+            // This cancels the `shutdown_pageserver` cancellation tree.
+            // Right now that tree doesn't reach very far, and `task_mgr` is used instead.
+            // The plan is to change that over time.
+            shutdown_pageserver.take();
+            pageserver::shutdown_pageserver(
+                http_endpoint_listener,
+                page_service,
+                consumption_metrics_tasks,
+                disk_usage_eviction_task,
+                &tenant_manager,
+                background_purges,
+                deletion_queue.clone(),
+                secondary_controller_tasks,
+                0,
+            )
+            .await;
+            unreachable!()
+        })
+    }
 }

 async fn create_remote_storage_client(
--- a/pageserver/src/consumption_metrics/upload.rs
+++ b/pageserver/src/consumption_metrics/upload.rs
@@ -1,4 +1,3 @@
-use std::error::Error as _;
 use std::time::SystemTime;

 use chrono::{DateTime, Utc};
@@ -351,11 +350,7 @@ impl std::fmt::Display for UploadError {

        match self {
            Rejected(code) => write!(f, "server rejected the metrics with {code}"),
-            Reqwest(e) => write!(
-                f,
-                "request failed: {e}{}",
-                e.source().map(|e| format!(": {e}")).unwrap_or_default()
-            ),
+            Reqwest(e) => write!(f, "request failed: {e}"),
            Cancelled => write!(f, "cancelled"),
        }
    }
--- a/pageserver/src/context.rs
+++ b/pageserver/src/context.rs
@@ -91,6 +91,8 @@

 use crate::task_mgr::TaskKind;

+pub(crate) mod optional_counter;
+
 // The main structure of this module, see module-level comment.
 #[derive(Debug)]
 pub struct RequestContext {
@@ -98,6 +100,7 @@ pub struct RequestContext {
    download_behavior: DownloadBehavior,
    access_stats_behavior: AccessStatsBehavior,
    page_content_kind: PageContentKind,
+    pub micros_spent_throttled: optional_counter::MicroSecondsCounterU32,
 }

 /// The kind of access to the page cache.
@@ -155,6 +158,7 @@ impl RequestContextBuilder {
                download_behavior: DownloadBehavior::Download,
                access_stats_behavior: AccessStatsBehavior::Update,
                page_content_kind: PageContentKind::Unknown,
+                micros_spent_throttled: Default::default(),
            },
        }
    }
@@ -168,6 +172,7 @@ impl RequestContextBuilder {
                download_behavior: original.download_behavior,
                access_stats_behavior: original.access_stats_behavior,
                page_content_kind: original.page_content_kind,
+                micros_spent_throttled: Default::default(),
            },
        }
    }
--- a/pageserver/src/context/optional_counter.rs
+++ b/pageserver/src/context/optional_counter.rs
@@ -0,0 +1,101 @@
+use std::{
+    sync::atomic::{AtomicU32, Ordering},
+    time::Duration,
+};
+
+#[derive(Debug)]
+pub struct CounterU32 {
+    inner: AtomicU32,
+}
+impl Default for CounterU32 {
+    fn default() -> Self {
+        Self {
+            inner: AtomicU32::new(u32::MAX),
+        }
+    }
+}
+impl CounterU32 {
+    pub fn open(&self) -> Result<(), &'static str> {
+        match self
+            .inner
+            .compare_exchange(u32::MAX, 0, Ordering::Relaxed, Ordering::Relaxed)
+        {
+            Ok(_) => Ok(()),
+            Err(_) => Err("open() called on clsoed state"),
+        }
+    }
+    pub fn close(&self) -> Result<u32, &'static str> {
+        match self.inner.swap(u32::MAX, Ordering::Relaxed) {
+            u32::MAX => Err("close() called on closed state"),
+            x => Ok(x),
+        }
+    }
+
+    pub fn add(&self, count: u32) -> Result<(), &'static str> {
+        if count == 0 {
+            return Ok(());
+        }
+        let mut had_err = None;
+        self.inner
+            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |cur| match cur {
+                u32::MAX => {
+                    had_err = Some("add() called on closed state");
+                    None
+                }
+                x => {
+                    let (new, overflowed) = x.overflowing_add(count);
+                    if new == u32::MAX || overflowed {
+                        had_err = Some("add() overflowed the counter");
+                        None
+                    } else {
+                        Some(new)
+                    }
+                }
+            })
+            .map_err(|_| had_err.expect("we set it whenever the function returns None"))
+            .map(|_| ())
+    }
+}
+
+#[derive(Default, Debug)]
+pub struct MicroSecondsCounterU32 {
+    inner: CounterU32,
+}
+
+impl MicroSecondsCounterU32 {
+    pub fn open(&self) -> Result<(), &'static str> {
+        self.inner.open()
+    }
+    pub fn add(&self, duration: Duration) -> Result<(), &'static str> {
+        match duration.as_micros().try_into() {
+            Ok(x) => self.inner.add(x),
+            Err(_) => Err("add(): duration conversion error"),
+        }
+    }
+    pub fn close_and_checked_sub_from(&self, from: Duration) -> Result<Duration, &'static str> {
+        let val = self.inner.close()?;
+        let val = Duration::from_micros(val as u64);
+        let subbed = match from.checked_sub(val) {
+            Some(v) => v,
+            None => return Err("Duration::checked_sub"),
+        };
+        Ok(subbed)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    fn test_basic() {
+        let counter = MicroSecondsCounterU32::default();
+        counter.open().unwrap();
+        counter.add(Duration::from_micros(23)).unwrap();
+        let res = counter
+            .close_and_checked_sub_from(Duration::from_micros(42))
+            .unwrap();
+        assert_eq!(res, Duration::from_micros(42 - 23));
+    }
+}
--- a/pageserver/src/controller_upcall_client.rs
+++ b/pageserver/src/controller_upcall_client.rs
@@ -115,10 +115,6 @@ impl ControllerUpcallClient {

        Ok(res)
    }
-
-    pub(crate) fn base_url(&self) -> &Url {
-        &self.base_url
-    }
 }

 impl ControlPlaneGenerationsApi for ControllerUpcallClient {
@@ -195,15 +191,13 @@ impl ControlPlaneGenerationsApi for ControllerUpcallClient {

        let request = ReAttachRequest {
            node_id: self.node_id,
-            register: register.clone(),
+            register,
        };

        let response: ReAttachResponse = self.retry_http_forever(&re_attach_path, request).await?;
        tracing::info!(
-            "Received re-attach response with {} tenants (node {}, register: {:?})",
-            response.tenants.len(),
-            self.node_id,
-            register,
+            "Received re-attach response with {} tenants",
+            response.tenants.len()
        );

        failpoint_support::sleep_millis_async!("control-plane-client-re-attach");
--- a/pageserver/src/http/routes.rs
+++ b/pageserver/src/http/routes.rs
@@ -56,9 +56,9 @@ use tokio_util::sync::CancellationToken;
 use tracing::*;
 use utils::auth::JwtAuth;
 use utils::failpoint_support::failpoints_handler;
-use utils::http::endpoint::{
-    profile_cpu_handler, profile_heap_handler, prometheus_metrics_handler, request_span,
-};
+use utils::http::endpoint::profile_cpu_handler;
+use utils::http::endpoint::prometheus_metrics_handler;
+use utils::http::endpoint::request_span;
 use utils::http::request::must_parse_query_param;
 use utils::http::request::{get_request_param, must_get_query_param, parse_query_param};

@@ -155,7 +155,6 @@ impl State {
            "/swagger.yml",
            "/metrics",
            "/profile/cpu",
-            "/profile/heap",
        ];
        Ok(Self {
            conf,
@@ -279,10 +278,7 @@ impl From<TenantStateError> for ApiError {
 impl From<GetTenantError> for ApiError {
    fn from(tse: GetTenantError) -> ApiError {
        match tse {
-            GetTenantError::NotFound(tid) => ApiError::NotFound(anyhow!("tenant {tid}").into()),
-            GetTenantError::ShardNotFound(tid) => {
-                ApiError::NotFound(anyhow!("tenant {tid}").into())
-            }
+            GetTenantError::NotFound(tid) => ApiError::NotFound(anyhow!("tenant {}", tid).into()),
            GetTenantError::NotActive(_) => {
                // Why is this not `ApiError::NotFound`?
                // Because we must be careful to never return 404 for a tenant if it does
@@ -390,16 +386,6 @@ impl From<crate::tenant::mgr::DeleteTenantError> for ApiError {
    }
 }

-impl From<crate::tenant::secondary::SecondaryTenantError> for ApiError {
-    fn from(ste: crate::tenant::secondary::SecondaryTenantError) -> ApiError {
-        use crate::tenant::secondary::SecondaryTenantError;
-        match ste {
-            SecondaryTenantError::GetTenant(gte) => gte.into(),
-            SecondaryTenantError::ShuttingDown => ApiError::ShuttingDown,
-        }
-    }
-}
-
 // Helper function to construct a TimelineInfo struct for a timeline
 async fn build_timeline_info(
    timeline: &Arc<Timeline>,
@@ -1060,11 +1046,9 @@ async fn timeline_delete_handler(
            match e {
                // GetTenantError has a built-in conversion to ApiError, but in this context we don't
                // want to treat missing tenants as 404, to avoid ambiguity with successful deletions.
-                GetTenantError::NotFound(_) | GetTenantError::ShardNotFound(_) => {
-                    ApiError::PreconditionFailed(
-                        "Requested tenant is missing".to_string().into_boxed_str(),
-                    )
-                }
+                GetTenantError::NotFound(_) => ApiError::PreconditionFailed(
+                    "Requested tenant is missing".to_string().into_boxed_str(),
+                ),
                e => e.into(),
            }
        })?;
@@ -2477,7 +2461,8 @@ async fn secondary_upload_handler(
    state
        .secondary_controller
        .upload_tenant(tenant_shard_id)
-        .await?;
+        .await
+        .map_err(ApiError::InternalServerError)?;

    json_response(StatusCode::OK, ())
 }
@@ -2592,7 +2577,7 @@ async fn secondary_download_handler(
        // Edge case: downloads aren't usually fallible: things like a missing heatmap are considered
        // okay.  We could get an error here in the unlikely edge case that the tenant
        // was detached between our check above and executing the download job.
-        Ok(Err(e)) => return Err(e.into()),
+        Ok(Err(e)) => return Err(ApiError::InternalServerError(e)),
        // A timeout is not an error: we have started the download, we're just not done
        // yet.  The caller will get a response body indicating status.
        Err(_) => StatusCode::ACCEPTED,
@@ -3218,7 +3203,6 @@ pub fn make_router(
        .data(state)
        .get("/metrics", |r| request_span(r, prometheus_metrics_handler))
        .get("/profile/cpu", |r| request_span(r, profile_cpu_handler))
-        .get("/profile/heap", |r| request_span(r, profile_heap_handler))
        .get("/v1/status", |r| api_handler(r, status_handler))
        .put("/v1/failpoints", |r| {
            testing_api_handler("manage failpoints", r, failpoints_handler)
--- a/pageserver/src/import_datadir.rs
+++ b/pageserver/src/import_datadir.rs
@@ -575,24 +575,18 @@ async fn import_file(
    } else if file_path.starts_with("pg_xact") {
        let slru = SlruKind::Clog;

-        if modification.tline.tenant_shard_id.is_shard_zero() {
-            import_slru(modification, slru, file_path, reader, len, ctx).await?;
-            debug!("imported clog slru");
-        }
+        import_slru(modification, slru, file_path, reader, len, ctx).await?;
+        debug!("imported clog slru");
    } else if file_path.starts_with("pg_multixact/offsets") {
        let slru = SlruKind::MultiXactOffsets;

-        if modification.tline.tenant_shard_id.is_shard_zero() {
-            import_slru(modification, slru, file_path, reader, len, ctx).await?;
-            debug!("imported multixact offsets slru");
-        }
+        import_slru(modification, slru, file_path, reader, len, ctx).await?;
+        debug!("imported multixact offsets slru");
    } else if file_path.starts_with("pg_multixact/members") {
        let slru = SlruKind::MultiXactMembers;

-        if modification.tline.tenant_shard_id.is_shard_zero() {
-            import_slru(modification, slru, file_path, reader, len, ctx).await?;
-            debug!("imported multixact members slru");
-        }
+        import_slru(modification, slru, file_path, reader, len, ctx).await?;
+        debug!("imported multixact members slru");
    } else if file_path.starts_with("pg_twophase") {
        let bytes = read_all_bytes(reader).await?;

--- a/pageserver/src/metrics.rs
+++ b/pageserver/src/metrics.rs
@@ -7,10 +7,6 @@ use metrics::{
    IntCounterPairVec, IntCounterVec, IntGauge, IntGaugeVec, UIntGauge, UIntGaugeVec,
 };
 use once_cell::sync::Lazy;
-use pageserver_api::config::{
-    PageServicePipeliningConfig, PageServicePipeliningConfigPipelined,
-    PageServiceProtocolPipelinedExecutionStrategy,
-};
 use pageserver_api::shard::TenantShardId;
 use postgres_backend::{is_expected_io_error, QueryError};
 use pq_proto::framed::ConnectionError;
@@ -217,16 +213,31 @@ impl<'a> ScanLatencyOngoingRecording<'a> {
        ScanLatencyOngoingRecording { parent, start }
    }

-    pub(crate) fn observe(self) {
+    pub(crate) fn observe(self, throttled: Option<Duration>) {
        let elapsed = self.start.elapsed();
-        self.parent.observe(elapsed.as_secs_f64());
+        let ex_throttled = if let Some(throttled) = throttled {
+            elapsed.checked_sub(throttled)
+        } else {
+            Some(elapsed)
+        };
+        if let Some(ex_throttled) = ex_throttled {
+            self.parent.observe(ex_throttled.as_secs_f64());
+        } else {
+            use utils::rate_limit::RateLimit;
+            static LOGGED: Lazy<Mutex<RateLimit>> =
+                Lazy::new(|| Mutex::new(RateLimit::new(Duration::from_secs(10))));
+            let mut rate_limit = LOGGED.lock().unwrap();
+            rate_limit.call(|| {
+                warn!("error deducting time spent throttled; this message is logged at a global rate limit");
+            });
+        }
    }
 }

 pub(crate) static GET_VECTORED_LATENCY: Lazy<GetVectoredLatency> = Lazy::new(|| {
    let inner = register_histogram_vec!(
        "pageserver_get_vectored_seconds",
-        "Time spent in get_vectored.",
+        "Time spent in get_vectored, excluding time spent in timeline_get_throttle.",
        &["task_kind"],
        CRITICAL_OP_BUCKETS.into(),
    )
@@ -249,7 +260,7 @@ pub(crate) static GET_VECTORED_LATENCY: Lazy<GetVectoredLatency> = Lazy::new(||
 pub(crate) static SCAN_LATENCY: Lazy<ScanLatency> = Lazy::new(|| {
    let inner = register_histogram_vec!(
        "pageserver_scan_seconds",
-        "Time spent in scan.",
+        "Time spent in scan, excluding time spent in timeline_get_throttle.",
        &["task_kind"],
        CRITICAL_OP_BUCKETS.into(),
    )
@@ -1205,33 +1216,28 @@ pub(crate) mod virtual_file_io_engine {
    });
 }

-pub(crate) struct SmgrOpTimer {
-    global_latency_histo: Histogram,
+struct GlobalAndPerTimelineHistogramTimer<'a, 'c> {
+    global_latency_histo: &'a Histogram,

    // Optional because not all op types are tracked per-timeline
-    per_timeline_latency_histo: Option<Histogram>,
+    per_timeline_latency_histo: Option<&'a Histogram>,

-    start: Instant,
-    throttled: Duration,
+    ctx: &'c RequestContext,
+    start: std::time::Instant,
    op: SmgrQueryType,
+    count: usize,
 }

-impl SmgrOpTimer {
-    pub(crate) fn deduct_throttle(&mut self, throttle: &Option<Duration>) {
-        let Some(throttle) = throttle else {
-            return;
-        };
-        self.throttled += *throttle;
-    }
-}
-
-impl Drop for SmgrOpTimer {
+impl Drop for GlobalAndPerTimelineHistogramTimer<'_, '_> {
    fn drop(&mut self) {
        let elapsed = self.start.elapsed();
-
-        let elapsed = match elapsed.checked_sub(self.throttled) {
-            Some(elapsed) => elapsed,
-            None => {
+        let ex_throttled = self
+            .ctx
+            .micros_spent_throttled
+            .close_and_checked_sub_from(elapsed);
+        let ex_throttled = match ex_throttled {
+            Ok(res) => res,
+            Err(error) => {
                use utils::rate_limit::RateLimit;
                static LOGGED: Lazy<Mutex<enum_map::EnumMap<SmgrQueryType, RateLimit>>> =
                    Lazy::new(|| {
@@ -1242,17 +1248,18 @@ impl Drop for SmgrOpTimer {
                let mut guard = LOGGED.lock().unwrap();
                let rate_limit = &mut guard[self.op];
                rate_limit.call(|| {
-                    warn!(op=?self.op, ?elapsed, ?self.throttled, "implementation error: time spent throttled exceeds total request wall clock time");
+                    warn!(op=?self.op, error, "error deducting time spent throttled; this message is logged at a global rate limit");
                });
-                elapsed // un-throttled time, more info than just saturating to 0
+                elapsed
            }
        };

-        let elapsed = elapsed.as_secs_f64();
-
-        self.global_latency_histo.observe(elapsed);
-        if let Some(per_timeline_getpage_histo) = &self.per_timeline_latency_histo {
-            per_timeline_getpage_histo.observe(elapsed);
+        for _ in 0..self.count {
+            self.global_latency_histo
+                .observe(ex_throttled.as_secs_f64());
+            if let Some(per_timeline_getpage_histo) = self.per_timeline_latency_histo {
+                per_timeline_getpage_histo.observe(ex_throttled.as_secs_f64());
+            }
        }
    }
 }
@@ -1282,8 +1289,6 @@ pub(crate) struct SmgrQueryTimePerTimeline {
    global_latency: [Histogram; SmgrQueryType::COUNT],
    per_timeline_getpage_started: IntCounter,
    per_timeline_getpage_latency: Histogram,
-    global_batch_size: Histogram,
-    per_timeline_batch_size: Histogram,
 }

 static SMGR_QUERY_STARTED_GLOBAL: Lazy<IntCounterVec> = Lazy::new(|| {
@@ -1376,76 +1381,6 @@ static SMGR_QUERY_TIME_GLOBAL: Lazy<HistogramVec> = Lazy::new(|| {
    .expect("failed to define a metric")
 });

-static PAGE_SERVICE_BATCH_SIZE_BUCKETS_GLOBAL: Lazy<Vec<f64>> = Lazy::new(|| {
-    (1..=u32::try_from(Timeline::MAX_GET_VECTORED_KEYS).unwrap())
-        .map(|v| v.into())
-        .collect()
-});
-
-static PAGE_SERVICE_BATCH_SIZE_GLOBAL: Lazy<Histogram> = Lazy::new(|| {
-    register_histogram!(
-        "pageserver_page_service_batch_size_global",
-        "Batch size of pageserver page service requests",
-        PAGE_SERVICE_BATCH_SIZE_BUCKETS_GLOBAL.clone(),
-    )
-    .expect("failed to define a metric")
-});
-
-static PAGE_SERVICE_BATCH_SIZE_BUCKETS_PER_TIMELINE: Lazy<Vec<f64>> = Lazy::new(|| {
-    let mut buckets = Vec::new();
-    for i in 0.. {
-        let bucket = 1 << i;
-        if bucket > u32::try_from(Timeline::MAX_GET_VECTORED_KEYS).unwrap() {
-            break;
-        }
-        buckets.push(bucket.into());
-    }
-    buckets
-});
-
-static PAGE_SERVICE_BATCH_SIZE_PER_TENANT_TIMELINE: Lazy<HistogramVec> = Lazy::new(|| {
-    register_histogram_vec!(
-        "pageserver_page_service_batch_size",
-        "Batch size of pageserver page service requests",
-        &["tenant_id", "shard_id", "timeline_id"],
-        PAGE_SERVICE_BATCH_SIZE_BUCKETS_PER_TIMELINE.clone()
-    )
-    .expect("failed to define a metric")
-});
-
-pub(crate) static PAGE_SERVICE_CONFIG_MAX_BATCH_SIZE: Lazy<IntGaugeVec> = Lazy::new(|| {
-    register_int_gauge_vec!(
-        "pageserver_page_service_config_max_batch_size",
-        "Configured maximum batch size for the server-side batching functionality of page_service. \
-         Labels expose more of the configuration parameters.",
-        &["mode", "execution"]
-    )
-    .expect("failed to define a metric")
-});
-
-fn set_page_service_config_max_batch_size(conf: &PageServicePipeliningConfig) {
-    PAGE_SERVICE_CONFIG_MAX_BATCH_SIZE.reset();
-    let (label_values, value) = match conf {
-        PageServicePipeliningConfig::Serial => (["serial", "-"], 1),
-        PageServicePipeliningConfig::Pipelined(PageServicePipeliningConfigPipelined {
-            max_batch_size,
-            execution,
-        }) => {
-            let mode = "pipelined";
-            let execution = match execution {
-                PageServiceProtocolPipelinedExecutionStrategy::ConcurrentFutures => {
-                    "concurrent-futures"
-                }
-                PageServiceProtocolPipelinedExecutionStrategy::Tasks => "tasks",
-            };
-            ([mode, execution], max_batch_size.get())
-        }
-    };
-    PAGE_SERVICE_CONFIG_MAX_BATCH_SIZE
-        .with_label_values(&label_values)
-        .set(value.try_into().unwrap());
-}
-
 impl SmgrQueryTimePerTimeline {
    pub(crate) fn new(tenant_shard_id: &TenantShardId, timeline_id: &TimelineId) -> Self {
        let tenant_id = tenant_shard_id.tenant_id.to_string();
@@ -1481,53 +1416,78 @@ impl SmgrQueryTimePerTimeline {
            ])
            .unwrap();

-        let global_batch_size = PAGE_SERVICE_BATCH_SIZE_GLOBAL.clone();
-        let per_timeline_batch_size = PAGE_SERVICE_BATCH_SIZE_PER_TENANT_TIMELINE
-            .get_metric_with_label_values(&[&tenant_id, &shard_slug, &timeline_id])
-            .unwrap();
-
        Self {
            global_started,
            global_latency,
            per_timeline_getpage_latency,
            per_timeline_getpage_started,
-            global_batch_size,
-            per_timeline_batch_size,
        }
    }
-    pub(crate) fn start_smgr_op(&self, op: SmgrQueryType, started_at: Instant) -> SmgrOpTimer {
+    pub(crate) fn start_timer<'c: 'a, 'a>(
+        &'a self,
+        op: SmgrQueryType,
+        ctx: &'c RequestContext,
+    ) -> Option<impl Drop + 'a> {
+        self.start_timer_many(op, 1, ctx)
+    }
+    pub(crate) fn start_timer_many<'c: 'a, 'a>(
+        &'a self,
+        op: SmgrQueryType,
+        count: usize,
+        ctx: &'c RequestContext,
+    ) -> Option<impl Drop + 'a> {
+        let start = Instant::now();
+
        self.global_started[op as usize].inc();

+        // We subtract time spent throttled from the observed latency.
+        match ctx.micros_spent_throttled.open() {
+            Ok(()) => (),
+            Err(error) => {
+                use utils::rate_limit::RateLimit;
+                static LOGGED: Lazy<Mutex<enum_map::EnumMap<SmgrQueryType, RateLimit>>> =
+                    Lazy::new(|| {
+                        Mutex::new(enum_map::EnumMap::from_array(std::array::from_fn(|_| {
+                            RateLimit::new(Duration::from_secs(10))
+                        })))
+                    });
+                let mut guard = LOGGED.lock().unwrap();
+                let rate_limit = &mut guard[op];
+                rate_limit.call(|| {
+                    warn!(?op, error, "error opening micros_spent_throttled; this message is logged at a global rate limit");
+                });
+            }
+        }
+
        let per_timeline_latency_histo = if matches!(op, SmgrQueryType::GetPageAtLsn) {
            self.per_timeline_getpage_started.inc();
-            Some(self.per_timeline_getpage_latency.clone())
+            Some(&self.per_timeline_getpage_latency)
        } else {
            None
        };

-        SmgrOpTimer {
-            global_latency_histo: self.global_latency[op as usize].clone(),
+        Some(GlobalAndPerTimelineHistogramTimer {
+            global_latency_histo: &self.global_latency[op as usize],
            per_timeline_latency_histo,
-            start: started_at,
+            ctx,
+            start,
            op,
-            throttled: Duration::ZERO,
-        }
-    }
-
-    pub(crate) fn observe_getpage_batch_start(&self, batch_size: usize) {
-        self.global_batch_size.observe(batch_size as f64);
-        self.per_timeline_batch_size.observe(batch_size as f64);
+            count,
+        })
    }
 }

 #[cfg(test)]
 mod smgr_query_time_tests {
-    use std::time::Instant;
-
    use pageserver_api::shard::TenantShardId;
    use strum::IntoEnumIterator;
    use utils::id::{TenantId, TimelineId};

+    use crate::{
+        context::{DownloadBehavior, RequestContext},
+        task_mgr::TaskKind,
+    };
+
    // Regression test, we used hard-coded string constants before using an enum.
    #[test]
    fn op_label_name() {
@@ -1571,7 +1531,8 @@ mod smgr_query_time_tests {
            let (pre_global, pre_per_tenant_timeline) = get_counts();
            assert_eq!(pre_per_tenant_timeline, 0);

-            let timer = metrics.start_smgr_op(*op, Instant::now());
+            let ctx = RequestContext::new(TaskKind::UnitTest, DownloadBehavior::Download);
+            let timer = metrics.start_timer(*op, &ctx);
            drop(timer);

            let (post_global, post_per_tenant_timeline) = get_counts();
@@ -1618,24 +1579,58 @@ pub(crate) static BASEBACKUP_QUERY_TIME: Lazy<BasebackupQueryTime> = Lazy::new(|
    }
 });

-pub(crate) struct BasebackupQueryTimeOngoingRecording<'a> {
+pub(crate) struct BasebackupQueryTimeOngoingRecording<'a, 'c> {
    parent: &'a BasebackupQueryTime,
+    ctx: &'c RequestContext,
    start: std::time::Instant,
 }

 impl BasebackupQueryTime {
-    pub(crate) fn start_recording(&self) -> BasebackupQueryTimeOngoingRecording<'_> {
+    pub(crate) fn start_recording<'c: 'a, 'a>(
+        &'a self,
+        ctx: &'c RequestContext,
+    ) -> BasebackupQueryTimeOngoingRecording<'a, 'a> {
        let start = Instant::now();
+        match ctx.micros_spent_throttled.open() {
+            Ok(()) => (),
+            Err(error) => {
+                use utils::rate_limit::RateLimit;
+                static LOGGED: Lazy<Mutex<RateLimit>> =
+                    Lazy::new(|| Mutex::new(RateLimit::new(Duration::from_secs(10))));
+                let mut rate_limit = LOGGED.lock().unwrap();
+                rate_limit.call(|| {
+                    warn!(error, "error opening micros_spent_throttled; this message is logged at a global rate limit");
+                });
+            }
+        }
        BasebackupQueryTimeOngoingRecording {
            parent: self,
+            ctx,
            start,
        }
    }
 }

-impl BasebackupQueryTimeOngoingRecording<'_> {
+impl BasebackupQueryTimeOngoingRecording<'_, '_> {
    pub(crate) fn observe<T>(self, res: &Result<T, QueryError>) {
-        let elapsed = self.start.elapsed().as_secs_f64();
+        let elapsed = self.start.elapsed();
+        let ex_throttled = self
+            .ctx
+            .micros_spent_throttled
+            .close_and_checked_sub_from(elapsed);
+        let ex_throttled = match ex_throttled {
+            Ok(ex_throttled) => ex_throttled,
+            Err(error) => {
+                use utils::rate_limit::RateLimit;
+                static LOGGED: Lazy<Mutex<RateLimit>> =
+                    Lazy::new(|| Mutex::new(RateLimit::new(Duration::from_secs(10))));
+                let mut rate_limit = LOGGED.lock().unwrap();
+                rate_limit.call(|| {
+                    warn!(error, "error deducting time spent throttled; this message is logged at a global rate limit");
+                });
+                elapsed
+            }
+        };
        // If you want to change categorize of a specific error, also change it in `log_query_error`.
        let metric = match res {
            Ok(_) => &self.parent.ok,
@@ -1646,7 +1641,7 @@ impl BasebackupQueryTimeOngoingRecording<'_> {
            }
            Err(_) => &self.parent.error,
        };
-        metric.observe(elapsed);
+        metric.observe(ex_throttled.as_secs_f64());
    }
 }

@@ -2727,11 +2722,6 @@ impl TimelineMetrics {
            shard_id,
            timeline_id,
        ]);
-        let _ = PAGE_SERVICE_BATCH_SIZE_PER_TENANT_TIMELINE.remove_label_values(&[
-            tenant_id,
-            shard_id,
-            timeline_id,
-        ]);
    }
 }

@@ -2757,12 +2747,10 @@ use std::sync::{Arc, Mutex};
 use std::task::{Context, Poll};
 use std::time::{Duration, Instant};

-use crate::config::PageServerConf;
 use crate::context::{PageContentKind, RequestContext};
 use crate::task_mgr::TaskKind;
 use crate::tenant::mgr::TenantSlot;
 use crate::tenant::tasks::BackgroundLoopKind;
-use crate::tenant::Timeline;

 /// Maintain a per timeline gauge in addition to the global gauge.
 pub(crate) struct PerTimelineRemotePhysicalSizeGauge {
@@ -3319,7 +3307,7 @@ pub(crate) mod tenant_throttling {
    use once_cell::sync::Lazy;
    use utils::shard::TenantShardId;

-    use crate::tenant::{self};
+    use crate::tenant::{self, throttle::Metric};

    struct GlobalAndPerTenantIntCounter {
        global: IntCounter,
@@ -3338,7 +3326,7 @@ pub(crate) mod tenant_throttling {
        }
    }

-    pub(crate) struct Metrics<const KIND: usize> {
+    pub(crate) struct TimelineGet {
        count_accounted_start: GlobalAndPerTenantIntCounter,
        count_accounted_finish: GlobalAndPerTenantIntCounter,
        wait_time: GlobalAndPerTenantIntCounter,
@@ -3411,41 +3399,40 @@ pub(crate) mod tenant_throttling {
        .unwrap()
    });

-    const KINDS: &[&str] = &["pagestream"];
-    pub type Pagestream = Metrics<0>;
+    const KIND: &str = "timeline_get";

-    impl<const KIND: usize> Metrics<KIND> {
+    impl TimelineGet {
        pub(crate) fn new(tenant_shard_id: &TenantShardId) -> Self {
            let per_tenant_label_values = &[
-                KINDS[KIND],
+                KIND,
                &tenant_shard_id.tenant_id.to_string(),
                &tenant_shard_id.shard_slug().to_string(),
            ];
-            Metrics {
+            TimelineGet {
                count_accounted_start: {
                    GlobalAndPerTenantIntCounter {
-                        global: COUNT_ACCOUNTED_START.with_label_values(&[KINDS[KIND]]),
+                        global: COUNT_ACCOUNTED_START.with_label_values(&[KIND]),
                        per_tenant: COUNT_ACCOUNTED_START_PER_TENANT
                            .with_label_values(per_tenant_label_values),
                    }
                },
                count_accounted_finish: {
                    GlobalAndPerTenantIntCounter {
-                        global: COUNT_ACCOUNTED_FINISH.with_label_values(&[KINDS[KIND]]),
+                        global: COUNT_ACCOUNTED_FINISH.with_label_values(&[KIND]),
                        per_tenant: COUNT_ACCOUNTED_FINISH_PER_TENANT
                            .with_label_values(per_tenant_label_values),
                    }
                },
                wait_time: {
                    GlobalAndPerTenantIntCounter {
-                        global: WAIT_USECS.with_label_values(&[KINDS[KIND]]),
+                        global: WAIT_USECS.with_label_values(&[KIND]),
                        per_tenant: WAIT_USECS_PER_TENANT
                            .with_label_values(per_tenant_label_values),
                    }
                },
                count_throttled: {
                    GlobalAndPerTenantIntCounter {
-                        global: WAIT_COUNT.with_label_values(&[KINDS[KIND]]),
+                        global: WAIT_COUNT.with_label_values(&[KIND]),
                        per_tenant: WAIT_COUNT_PER_TENANT
                            .with_label_values(per_tenant_label_values),
                    }
@@ -3468,17 +3455,15 @@ pub(crate) mod tenant_throttling {
            &WAIT_USECS_PER_TENANT,
            &WAIT_COUNT_PER_TENANT,
        ] {
-            for kind in KINDS {
-                let _ = m.remove_label_values(&[
-                    kind,
-                    &tenant_shard_id.tenant_id.to_string(),
-                    &tenant_shard_id.shard_slug().to_string(),
-                ]);
-            }
+            let _ = m.remove_label_values(&[
+                KIND,
+                &tenant_shard_id.tenant_id.to_string(),
+                &tenant_shard_id.shard_slug().to_string(),
+            ]);
        }
    }

-    impl<const KIND: usize> tenant::throttle::Metric for Metrics<KIND> {
+    impl Metric for TimelineGet {
        #[inline(always)]
        fn accounting_start(&self) {
            self.count_accounted_start.inc();
@@ -3577,9 +3562,7 @@ pub(crate) fn set_tokio_runtime_setup(setup: &str, num_threads: NonZeroUsize) {
        .set(u64::try_from(num_threads.get()).unwrap());
 }

-pub fn preinitialize_metrics(conf: &'static PageServerConf) {
-    set_page_service_config_max_batch_size(&conf.page_service_pipelining);
-
+pub fn preinitialize_metrics() {
    // Python tests need these and on some we do alerting.
    //
    // FIXME(4813): make it so that we have no top level metrics as this fn will easily fall out of
@@ -3647,7 +3630,6 @@ pub fn preinitialize_metrics(conf: &'static PageServerConf) {
        &WAL_REDO_RECORDS_HISTOGRAM,
        &WAL_REDO_BYTES_HISTOGRAM,
        &WAL_REDO_PROCESS_LAUNCH_DURATION_HISTOGRAM,
-        &PAGE_SERVICE_BATCH_SIZE_GLOBAL,
    ]
    .into_iter()
    .for_each(|h| {
--- a/pageserver/src/page_service.rs
+++ b/pageserver/src/page_service.rs
@@ -51,7 +51,7 @@ use crate::auth::check_permission;
 use crate::basebackup::BasebackupError;
 use crate::config::PageServerConf;
 use crate::context::{DownloadBehavior, RequestContext};
-use crate::metrics::{self, SmgrOpTimer};
+use crate::metrics::{self};
 use crate::metrics::{ComputeCommandKind, COMPUTE_COMMANDS_COUNTERS, LIVE_CONNECTIONS};
 use crate::pgdatadir_mapping::Version;
 use crate::span::debug_assert_current_span_has_tenant_and_timeline_id;
@@ -540,13 +540,11 @@ impl From<WaitLsnError> for QueryError {
 enum BatchedFeMessage {
    Exists {
        span: Span,
-        timer: SmgrOpTimer,
        shard: timeline::handle::Handle<TenantManagerTypes>,
        req: models::PagestreamExistsRequest,
    },
    Nblocks {
        span: Span,
-        timer: SmgrOpTimer,
        shard: timeline::handle::Handle<TenantManagerTypes>,
        req: models::PagestreamNblocksRequest,
    },
@@ -554,17 +552,15 @@ enum BatchedFeMessage {
        span: Span,
        shard: timeline::handle::Handle<TenantManagerTypes>,
        effective_request_lsn: Lsn,
-        pages: smallvec::SmallVec<[(RelTag, BlockNumber, SmgrOpTimer); 1]>,
+        pages: smallvec::SmallVec<[(RelTag, BlockNumber); 1]>,
    },
    DbSize {
        span: Span,
-        timer: SmgrOpTimer,
        shard: timeline::handle::Handle<TenantManagerTypes>,
        req: models::PagestreamDbSizeRequest,
    },
    GetSlruSegment {
        span: Span,
-        timer: SmgrOpTimer,
        shard: timeline::handle::Handle<TenantManagerTypes>,
        req: models::PagestreamGetSlruSegmentRequest,
    },
@@ -574,41 +570,6 @@ enum BatchedFeMessage {
    },
 }

-impl BatchedFeMessage {
-    async fn throttle(&mut self, cancel: &CancellationToken) -> Result<(), QueryError> {
-        let (shard, tokens, timers) = match self {
-            BatchedFeMessage::Exists { shard, timer, .. }
-            | BatchedFeMessage::Nblocks { shard, timer, .. }
-            | BatchedFeMessage::DbSize { shard, timer, .. }
-            | BatchedFeMessage::GetSlruSegment { shard, timer, .. } => {
-                (
-                    shard,
-                    // 1 token is probably under-estimating because these
-                    // request handlers typically do several Timeline::get calls.
-                    1,
-                    itertools::Either::Left(std::iter::once(timer)),
-                )
-            }
-            BatchedFeMessage::GetPage { shard, pages, .. } => (
-                shard,
-                pages.len(),
-                itertools::Either::Right(pages.iter_mut().map(|(_, _, timer)| timer)),
-            ),
-            BatchedFeMessage::RespondError { .. } => return Ok(()),
-        };
-        let throttled = tokio::select! {
-            throttled = shard.pagestream_throttle.throttle(tokens) => { throttled }
-            _ = cancel.cancelled() => {
-                return Err(QueryError::Shutdown);
-            }
-        };
-        for timer in timers {
-            timer.deduct_throttle(&throttled);
-        }
-        Ok(())
-    }
-}
-
 impl PageServerHandler {
    pub fn new(
        tenant_manager: Arc<TenantManager>,
@@ -671,8 +632,6 @@ impl PageServerHandler {
            msg = pgb.read_message() => { msg }
        };

-        let received_at = Instant::now();
-
        let copy_data_bytes = match msg? {
            Some(FeMessage::CopyData(bytes)) => bytes,
            Some(FeMessage::Terminate) => {
@@ -701,15 +660,7 @@ impl PageServerHandler {
                    .get(tenant_id, timeline_id, ShardSelector::Zero)
                    .instrument(span.clone()) // sets `shard_id` field
                    .await?;
-                let timer = shard
-                    .query_metrics
-                    .start_smgr_op(metrics::SmgrQueryType::GetRelExists, received_at);
-                BatchedFeMessage::Exists {
-                    span,
-                    timer,
-                    shard,
-                    req,
-                }
+                BatchedFeMessage::Exists { span, shard, req }
            }
            PagestreamFeMessage::Nblocks(req) => {
                let span = tracing::info_span!(parent: parent_span, "handle_get_nblocks_request", rel = %req.rel, req_lsn = %req.request_lsn);
@@ -717,15 +668,7 @@ impl PageServerHandler {
                    .get(tenant_id, timeline_id, ShardSelector::Zero)
                    .instrument(span.clone()) // sets `shard_id` field
                    .await?;
-                let timer = shard
-                    .query_metrics
-                    .start_smgr_op(metrics::SmgrQueryType::GetRelSize, received_at);
-                BatchedFeMessage::Nblocks {
-                    span,
-                    timer,
-                    shard,
-                    req,
-                }
+                BatchedFeMessage::Nblocks { span, shard, req }
            }
            PagestreamFeMessage::DbSize(req) => {
                let span = tracing::info_span!(parent: parent_span, "handle_db_size_request", dbnode = %req.dbnode, req_lsn = %req.request_lsn);
@@ -733,15 +676,7 @@ impl PageServerHandler {
                    .get(tenant_id, timeline_id, ShardSelector::Zero)
                    .instrument(span.clone()) // sets `shard_id` field
                    .await?;
-                let timer = shard
-                    .query_metrics
-                    .start_smgr_op(metrics::SmgrQueryType::GetDbSize, received_at);
-                BatchedFeMessage::DbSize {
-                    span,
-                    timer,
-                    shard,
-                    req,
-                }
+                BatchedFeMessage::DbSize { span, shard, req }
            }
            PagestreamFeMessage::GetSlruSegment(req) => {
                let span = tracing::info_span!(parent: parent_span, "handle_get_slru_segment_request", kind = %req.kind, segno = %req.segno, req_lsn = %req.request_lsn);
@@ -749,15 +684,7 @@ impl PageServerHandler {
                    .get(tenant_id, timeline_id, ShardSelector::Zero)
                    .instrument(span.clone()) // sets `shard_id` field
                    .await?;
-                let timer = shard
-                    .query_metrics
-                    .start_smgr_op(metrics::SmgrQueryType::GetSlruSegment, received_at);
-                BatchedFeMessage::GetSlruSegment {
-                    span,
-                    timer,
-                    shard,
-                    req,
-                }
+                BatchedFeMessage::GetSlruSegment { span, shard, req }
            }
            PagestreamFeMessage::GetPage(PagestreamGetPageRequest {
                request_lsn,
@@ -801,14 +728,6 @@ impl PageServerHandler {
                        return respond_error!(e.into());
                    }
                };
-
-                // It's important to start the timer before waiting for the LSN
-                // so that the _started counters are incremented before we do
-                // any serious waiting, e.g., for LSNs.
-                let timer = shard
-                    .query_metrics
-                    .start_smgr_op(metrics::SmgrQueryType::GetPageAtLsn, received_at);
-
                let effective_request_lsn = match Self::wait_or_get_last_lsn(
                    &shard,
                    request_lsn,
@@ -828,7 +747,7 @@ impl PageServerHandler {
                    span,
                    shard,
                    effective_request_lsn,
-                    pages: smallvec::smallvec![(rel, blkno, timer)],
+                    pages: smallvec::smallvec![(rel, blkno)],
                }
            }
        };
@@ -913,112 +832,88 @@ impl PageServerHandler {
        IO: AsyncRead + AsyncWrite + Send + Sync + Unpin,
    {
        // invoke handler function
-        let (handler_results, span): (
-            Vec<Result<(PagestreamBeMessage, SmgrOpTimer), PageStreamError>>,
-            _,
-        ) = match batch {
-            BatchedFeMessage::Exists {
-                span,
-                timer,
-                shard,
-                req,
-            } => {
-                fail::fail_point!("ps::handle-pagerequest-message::exists");
-                (
-                    vec![self
-                        .handle_get_rel_exists_request(&shard, &req, ctx)
-                        .instrument(span.clone())
-                        .await
-                        .map(|msg| (msg, timer))],
+        let (handler_results, span): (Vec<Result<PagestreamBeMessage, PageStreamError>>, _) =
+            match batch {
+                BatchedFeMessage::Exists { span, shard, req } => {
+                    fail::fail_point!("ps::handle-pagerequest-message::exists");
+                    (
+                        vec![
+                            self.handle_get_rel_exists_request(&shard, &req, ctx)
+                                .instrument(span.clone())
+                                .await,
+                        ],
+                        span,
+                    )
+                }
+                BatchedFeMessage::Nblocks { span, shard, req } => {
+                    fail::fail_point!("ps::handle-pagerequest-message::nblocks");
+                    (
+                        vec![
+                            self.handle_get_nblocks_request(&shard, &req, ctx)
+                                .instrument(span.clone())
+                                .await,
+                        ],
+                        span,
+                    )
+                }
+                BatchedFeMessage::GetPage {
                    span,
-                )
-            }
-            BatchedFeMessage::Nblocks {
-                span,
-                timer,
-                shard,
-                req,
-            } => {
-                fail::fail_point!("ps::handle-pagerequest-message::nblocks");
-                (
-                    vec![self
-                        .handle_get_nblocks_request(&shard, &req, ctx)
-                        .instrument(span.clone())
-                        .await
-                        .map(|msg| (msg, timer))],
-                    span,
-                )
-            }
-            BatchedFeMessage::GetPage {
-                span,
-                shard,
-                effective_request_lsn,
-                pages,
-            } => {
-                fail::fail_point!("ps::handle-pagerequest-message::getpage");
-                (
-                    {
-                        let npages = pages.len();
-                        trace!(npages, "handling getpage request");
-                        let res = self
-                            .handle_get_page_at_lsn_request_batched(
-                                &shard,
-                                effective_request_lsn,
-                                pages,
-                                ctx,
-                            )
-                            .instrument(span.clone())
-                            .await;
-                        assert_eq!(res.len(), npages);
-                        res
-                    },
-                    span,
-                )
-            }
-            BatchedFeMessage::DbSize {
-                span,
-                timer,
-                shard,
-                req,
-            } => {
-                fail::fail_point!("ps::handle-pagerequest-message::dbsize");
-                (
-                    vec![self
-                        .handle_db_size_request(&shard, &req, ctx)
-                        .instrument(span.clone())
-                        .await
-                        .map(|msg| (msg, timer))],
-                    span,
-                )
-            }
-            BatchedFeMessage::GetSlruSegment {
-                span,
-                timer,
-                shard,
-                req,
-            } => {
-                fail::fail_point!("ps::handle-pagerequest-message::slrusegment");
-                (
-                    vec![self
-                        .handle_get_slru_segment_request(&shard, &req, ctx)
-                        .instrument(span.clone())
-                        .await
-                        .map(|msg| (msg, timer))],
-                    span,
-                )
-            }
-            BatchedFeMessage::RespondError { span, error } => {
-                // We've already decided to respond with an error, so we don't need to
-                // call the handler.
-                (vec![Err(error)], span)
-            }
-        };
+                    shard,
+                    effective_request_lsn,
+                    pages,
+                } => {
+                    fail::fail_point!("ps::handle-pagerequest-message::getpage");
+                    (
+                        {
+                            let npages = pages.len();
+                            trace!(npages, "handling getpage request");
+                            let res = self
+                                .handle_get_page_at_lsn_request_batched(
+                                    &shard,
+                                    effective_request_lsn,
+                                    pages,
+                                    ctx,
+                                )
+                                .instrument(span.clone())
+                                .await;
+                            assert_eq!(res.len(), npages);
+                            res
+                        },
+                        span,
+                    )
+                }
+                BatchedFeMessage::DbSize { span, shard, req } => {
+                    fail::fail_point!("ps::handle-pagerequest-message::dbsize");
+                    (
+                        vec![
+                            self.handle_db_size_request(&shard, &req, ctx)
+                                .instrument(span.clone())
+                                .await,
+                        ],
+                        span,
+                    )
+                }
+                BatchedFeMessage::GetSlruSegment { span, shard, req } => {
+                    fail::fail_point!("ps::handle-pagerequest-message::slrusegment");
+                    (
+                        vec![
+                            self.handle_get_slru_segment_request(&shard, &req, ctx)
+                                .instrument(span.clone())
+                                .await,
+                        ],
+                        span,
+                    )
+                }
+                BatchedFeMessage::RespondError { span, error } => {
+                    // We've already decided to respond with an error, so we don't need to
+                    // call the handler.
+                    (vec![Err(error)], span)
+                }
+            };

        // Map handler result to protocol behavior.
        // Some handler errors cause exit from pagestream protocol.
        // Other handler errors are sent back as an error message and we stay in pagestream protocol.
-        let mut timers: smallvec::SmallVec<[_; 1]> =
-            smallvec::SmallVec::with_capacity(handler_results.len());
        for handler_result in handler_results {
            let response_msg = match handler_result {
                Err(e) => match &e {
@@ -1049,12 +944,7 @@ impl PageServerHandler {
                        })
                    }
                },
-                Ok((response_msg, timer)) => {
-                    // Extending the lifetime of the timers so observations on drop
-                    // include the flush time.
-                    timers.push(timer);
-                    response_msg
-                }
+                Ok(response_msg) => response_msg,
            };

            // marshal & transmit response message
@@ -1071,7 +961,6 @@ impl PageServerHandler {
                res?;
            }
        }
-        drop(timers);
        Ok(())
    }

@@ -1192,18 +1081,13 @@ impl PageServerHandler {
                Ok(msg) => msg,
                Err(e) => break e,
            };
-            let mut msg = match msg {
+            let msg = match msg {
                Some(msg) => msg,
                None => {
                    debug!("pagestream subprotocol end observed");
                    return ((pgb_reader, timeline_handles), Ok(()));
                }
            };
-
-            if let Err(cancelled) = msg.throttle(&self.cancel).await {
-                break cancelled;
-            }
-
            let err = self
                .pagesteam_handle_batched_message(pgb_writer, msg, &cancel, ctx)
                .await;
@@ -1361,13 +1245,12 @@ impl PageServerHandler {
                            return Ok(());
                        }
                    };
-                    let mut batch = match batch {
+                    let batch = match batch {
                        Ok(batch) => batch,
                        Err(e) => {
                            return Err(e);
                        }
                    };
-                    batch.throttle(&self.cancel).await?;
                    self.pagesteam_handle_batched_message(pgb_writer, batch, &cancel, &ctx)
                        .await?;
                }
@@ -1540,6 +1423,10 @@ impl PageServerHandler {
        req: &PagestreamExistsRequest,
        ctx: &RequestContext,
    ) -> Result<PagestreamBeMessage, PageStreamError> {
+        let _timer = timeline
+            .query_metrics
+            .start_timer(metrics::SmgrQueryType::GetRelExists, ctx);
+
        let latest_gc_cutoff_lsn = timeline.get_latest_gc_cutoff_lsn();
        let lsn = Self::wait_or_get_last_lsn(
            timeline,
@@ -1566,6 +1453,10 @@ impl PageServerHandler {
        req: &PagestreamNblocksRequest,
        ctx: &RequestContext,
    ) -> Result<PagestreamBeMessage, PageStreamError> {
+        let _timer = timeline
+            .query_metrics
+            .start_timer(metrics::SmgrQueryType::GetRelSize, ctx);
+
        let latest_gc_cutoff_lsn = timeline.get_latest_gc_cutoff_lsn();
        let lsn = Self::wait_or_get_last_lsn(
            timeline,
@@ -1592,6 +1483,10 @@ impl PageServerHandler {
        req: &PagestreamDbSizeRequest,
        ctx: &RequestContext,
    ) -> Result<PagestreamBeMessage, PageStreamError> {
+        let _timer = timeline
+            .query_metrics
+            .start_timer(metrics::SmgrQueryType::GetDbSize, ctx);
+
        let latest_gc_cutoff_lsn = timeline.get_latest_gc_cutoff_lsn();
        let lsn = Self::wait_or_get_last_lsn(
            timeline,
@@ -1617,41 +1512,26 @@ impl PageServerHandler {
        &mut self,
        timeline: &Timeline,
        effective_lsn: Lsn,
-        requests: smallvec::SmallVec<[(RelTag, BlockNumber, SmgrOpTimer); 1]>,
+        pages: smallvec::SmallVec<[(RelTag, BlockNumber); 1]>,
        ctx: &RequestContext,
-    ) -> Vec<Result<(PagestreamBeMessage, SmgrOpTimer), PageStreamError>> {
+    ) -> Vec<Result<PagestreamBeMessage, PageStreamError>> {
        debug_assert_current_span_has_tenant_and_timeline_id();
+        let _timer = timeline.query_metrics.start_timer_many(
+            metrics::SmgrQueryType::GetPageAtLsn,
+            pages.len(),
+            ctx,
+        );

-        timeline
-            .query_metrics
-            .observe_getpage_batch_start(requests.len());
-
-        let results = timeline
-            .get_rel_page_at_lsn_batched(
-                requests.iter().map(|(reltag, blkno, _)| (reltag, blkno)),
-                effective_lsn,
-                ctx,
-            )
+        let pages = timeline
+            .get_rel_page_at_lsn_batched(pages, effective_lsn, ctx)
            .await;
-        assert_eq!(results.len(), requests.len());

-        // TODO: avoid creating the new Vec here
-        Vec::from_iter(
-            requests
-                .into_iter()
-                .zip(results.into_iter())
-                .map(|((_, _, timer), res)| {
-                    res.map(|page| {
-                        (
-                            PagestreamBeMessage::GetPage(models::PagestreamGetPageResponse {
-                                page,
-                            }),
-                            timer,
-                        )
-                    })
-                    .map_err(PageStreamError::from)
-                }),
-        )
+        Vec::from_iter(pages.into_iter().map(|page| {
+            page.map(|page| {
+                PagestreamBeMessage::GetPage(models::PagestreamGetPageResponse { page })
+            })
+            .map_err(PageStreamError::from)
+        }))
    }

    #[instrument(skip_all, fields(shard_id))]
@@ -1661,6 +1541,10 @@ impl PageServerHandler {
        req: &PagestreamGetSlruSegmentRequest,
        ctx: &RequestContext,
    ) -> Result<PagestreamBeMessage, PageStreamError> {
+        let _timer = timeline
+            .query_metrics
+            .start_timer(metrics::SmgrQueryType::GetSlruSegment, ctx);
+
        let latest_gc_cutoff_lsn = timeline.get_latest_gc_cutoff_lsn();
        let lsn = Self::wait_or_get_last_lsn(
            timeline,
@@ -2161,7 +2045,7 @@ where
                COMPUTE_COMMANDS_COUNTERS
                    .for_command(ComputeCommandKind::Basebackup)
                    .inc();
-                let metric_recording = metrics::BASEBACKUP_QUERY_TIME.start_recording();
+                let metric_recording = metrics::BASEBACKUP_QUERY_TIME.start_recording(&ctx);
                let res = async {
                    self.handle_basebackup_request(
                        pgb,
--- a/pageserver/src/pgdatadir_mapping.rs
+++ b/pageserver/src/pgdatadir_mapping.rs
@@ -203,13 +203,9 @@ impl Timeline {
    ) -> Result<Bytes, PageReconstructError> {
        match version {
            Version::Lsn(effective_lsn) => {
-                let pages: smallvec::SmallVec<[_; 1]> = smallvec::smallvec![(tag, blknum)];
+                let pages = smallvec::smallvec![(tag, blknum)];
                let res = self
-                    .get_rel_page_at_lsn_batched(
-                        pages.iter().map(|(tag, blknum)| (tag, blknum)),
-                        effective_lsn,
-                        ctx,
-                    )
+                    .get_rel_page_at_lsn_batched(pages, effective_lsn, ctx)
                    .await;
                assert_eq!(res.len(), 1);
                res.into_iter().next().unwrap()
@@ -244,7 +240,7 @@ impl Timeline {
    /// The ordering of the returned vec corresponds to the ordering of `pages`.
    pub(crate) async fn get_rel_page_at_lsn_batched(
        &self,
-        pages: impl ExactSizeIterator<Item = (&RelTag, &BlockNumber)>,
+        pages: smallvec::SmallVec<[(RelTag, BlockNumber); 1]>,
        effective_lsn: Lsn,
        ctx: &RequestContext,
    ) -> Vec<Result<Bytes, PageReconstructError>> {
@@ -258,7 +254,7 @@ impl Timeline {
        let result_slots = result.spare_capacity_mut();

        let mut keys_slots: BTreeMap<Key, smallvec::SmallVec<[usize; 1]>> = BTreeMap::default();
-        for (response_slot_idx, (tag, blknum)) in pages.enumerate() {
+        for (response_slot_idx, (tag, blknum)) in pages.into_iter().enumerate() {
            if tag.relnode == 0 {
                result_slots[response_slot_idx].write(Err(PageReconstructError::Other(
                    RelationError::InvalidRelnode.into(),
@@ -269,7 +265,7 @@ impl Timeline {
            }

            let nblocks = match self
-                .get_rel_size(*tag, Version::Lsn(effective_lsn), ctx)
+                .get_rel_size(tag, Version::Lsn(effective_lsn), ctx)
                .await
            {
                Ok(nblocks) => nblocks,
@@ -280,7 +276,7 @@ impl Timeline {
                }
            };

-            if *blknum >= nblocks {
+            if blknum >= nblocks {
                debug!(
                    "read beyond EOF at {} blk {} at {}, size is {}: returning all-zeros page",
                    tag, blknum, effective_lsn, nblocks
@@ -290,7 +286,7 @@ impl Timeline {
                continue;
            }

-            let key = rel_block_to_key(*tag, *blknum);
+            let key = rel_block_to_key(tag, blknum);

            let key_slots = keys_slots.entry(key).or_default();
            key_slots.push(response_slot_idx);
@@ -530,7 +526,6 @@ impl Timeline {
        lsn: Lsn,
        ctx: &RequestContext,
    ) -> Result<Bytes, PageReconstructError> {
-        assert!(self.tenant_shard_id.is_shard_zero());
        let n_blocks = self
            .get_slru_segment_size(kind, segno, Version::Lsn(lsn), ctx)
            .await?;
@@ -553,7 +548,6 @@ impl Timeline {
        lsn: Lsn,
        ctx: &RequestContext,
    ) -> Result<Bytes, PageReconstructError> {
-        assert!(self.tenant_shard_id.is_shard_zero());
        let key = slru_block_to_key(kind, segno, blknum);
        self.get(key, lsn, ctx).await
    }
@@ -566,7 +560,6 @@ impl Timeline {
        version: Version<'_>,
        ctx: &RequestContext,
    ) -> Result<BlockNumber, PageReconstructError> {
-        assert!(self.tenant_shard_id.is_shard_zero());
        let key = slru_segment_size_to_key(kind, segno);
        let mut buf = version.get(self, key, ctx).await?;
        Ok(buf.get_u32_le())
@@ -580,7 +573,6 @@ impl Timeline {
        version: Version<'_>,
        ctx: &RequestContext,
    ) -> Result<bool, PageReconstructError> {
-        assert!(self.tenant_shard_id.is_shard_zero());
        // fetch directory listing
        let key = slru_dir_to_key(kind);
        let buf = version.get(self, key, ctx).await?;
@@ -1051,28 +1043,26 @@ impl Timeline {
        }

        // Iterate SLRUs next
-        if self.tenant_shard_id.is_shard_zero() {
-            for kind in [
-                SlruKind::Clog,
-                SlruKind::MultiXactMembers,
-                SlruKind::MultiXactOffsets,
-            ] {
-                let slrudir_key = slru_dir_to_key(kind);
-                result.add_key(slrudir_key);
-                let buf = self.get(slrudir_key, lsn, ctx).await?;
-                let dir = SlruSegmentDirectory::des(&buf)?;
-                let mut segments: Vec<u32> = dir.segments.iter().cloned().collect();
-                segments.sort_unstable();
-                for segno in segments {
-                    let segsize_key = slru_segment_size_to_key(kind, segno);
-                    let mut buf = self.get(segsize_key, lsn, ctx).await?;
-                    let segsize = buf.get_u32_le();
+        for kind in [
+            SlruKind::Clog,
+            SlruKind::MultiXactMembers,
+            SlruKind::MultiXactOffsets,
+        ] {
+            let slrudir_key = slru_dir_to_key(kind);
+            result.add_key(slrudir_key);
+            let buf = self.get(slrudir_key, lsn, ctx).await?;
+            let dir = SlruSegmentDirectory::des(&buf)?;
+            let mut segments: Vec<u32> = dir.segments.iter().cloned().collect();
+            segments.sort_unstable();
+            for segno in segments {
+                let segsize_key = slru_segment_size_to_key(kind, segno);
+                let mut buf = self.get(segsize_key, lsn, ctx).await?;
+                let segsize = buf.get_u32_le();

-                    result.add_range(
-                        slru_block_to_key(kind, segno, 0)..slru_block_to_key(kind, segno, segsize),
-                    );
-                    result.add_key(segsize_key);
-                }
+                result.add_range(
+                    slru_block_to_key(kind, segno, 0)..slru_block_to_key(kind, segno, segsize),
+                );
+                result.add_key(segsize_key);
            }
        }

@@ -1474,10 +1464,6 @@ impl<'a> DatadirModification<'a> {
        blknum: BlockNumber,
        rec: NeonWalRecord,
    ) -> anyhow::Result<()> {
-        if !self.tline.tenant_shard_id.is_shard_zero() {
-            return Ok(());
-        }
-
        self.put(
            slru_block_to_key(kind, segno, blknum),
            Value::WalRecord(rec),
@@ -1511,8 +1497,6 @@ impl<'a> DatadirModification<'a> {
        blknum: BlockNumber,
        img: Bytes,
    ) -> anyhow::Result<()> {
-        assert!(self.tline.tenant_shard_id.is_shard_zero());
-
        let key = slru_block_to_key(kind, segno, blknum);
        if !key.is_valid_key_on_write_path() {
            anyhow::bail!(
@@ -1554,7 +1538,6 @@ impl<'a> DatadirModification<'a> {
        segno: u32,
        blknum: BlockNumber,
    ) -> anyhow::Result<()> {
-        assert!(self.tline.tenant_shard_id.is_shard_zero());
        let key = slru_block_to_key(kind, segno, blknum);
        if !key.is_valid_key_on_write_path() {
            anyhow::bail!(
@@ -1866,8 +1849,6 @@ impl<'a> DatadirModification<'a> {
        nblocks: BlockNumber,
        ctx: &RequestContext,
    ) -> anyhow::Result<()> {
-        assert!(self.tline.tenant_shard_id.is_shard_zero());
-
        // Add it to the directory entry
        let dir_key = slru_dir_to_key(kind);
        let buf = self.get(dir_key, ctx).await?;
@@ -1900,8 +1881,6 @@ impl<'a> DatadirModification<'a> {
        segno: u32,
        nblocks: BlockNumber,
    ) -> anyhow::Result<()> {
-        assert!(self.tline.tenant_shard_id.is_shard_zero());
-
        // Put size
        let size_key = slru_segment_size_to_key(kind, segno);
        let buf = nblocks.to_le_bytes();
--- a/pageserver/src/tenant.rs
+++ b/pageserver/src/tenant.rs
@@ -357,8 +357,8 @@ pub struct Tenant {

    /// Throttle applied at the top of [`Timeline::get`].
    /// All [`Tenant::timelines`] of a given [`Tenant`] instance share the same [`throttle::Throttle`] instance.
-    pub(crate) pagestream_throttle:
-        Arc<throttle::Throttle<crate::metrics::tenant_throttling::Pagestream>>,
+    pub(crate) timeline_get_throttle:
+        Arc<throttle::Throttle<crate::metrics::tenant_throttling::TimelineGet>>,

    /// An ongoing timeline detach concurrency limiter.
    ///
@@ -1678,7 +1678,7 @@ impl Tenant {
                    remote_metadata,
                    TimelineResources {
                        remote_client,
-                        pagestream_throttle: self.pagestream_throttle.clone(),
+                        timeline_get_throttle: self.timeline_get_throttle.clone(),
                        l0_flush_global_state: self.l0_flush_global_state.clone(),
                    },
                    LoadTimelineCause::Attach,
@@ -3422,7 +3422,7 @@ impl Tenant {
                            r.map_err(
                            |_e: tokio::sync::watch::error::RecvError|
                                // Tenant existed but was dropped: report it as non-existent
-                                GetActiveTenantError::NotFound(GetTenantError::ShardNotFound(self.tenant_shard_id))
+                                GetActiveTenantError::NotFound(GetTenantError::NotFound(self.tenant_shard_id.tenant_id))
                        )?
                        }
                        Err(TimeoutCancellableError::Cancelled) => {
@@ -3835,7 +3835,7 @@ impl Tenant {
        }
    }

-    fn get_pagestream_throttle_config(
+    fn get_timeline_get_throttle_config(
        psconf: &'static PageServerConf,
        overrides: &TenantConfOpt,
    ) -> throttle::Config {
@@ -3846,8 +3846,8 @@ impl Tenant {
    }

    pub(crate) fn tenant_conf_updated(&self, new_conf: &TenantConfOpt) {
-        let conf = Self::get_pagestream_throttle_config(self.conf, new_conf);
-        self.pagestream_throttle.reconfigure(conf)
+        let conf = Self::get_timeline_get_throttle_config(self.conf, new_conf);
+        self.timeline_get_throttle.reconfigure(conf)
    }

    /// Helper function to create a new Timeline struct.
@@ -4009,9 +4009,9 @@ impl Tenant {
            attach_wal_lag_cooldown: Arc::new(std::sync::OnceLock::new()),
            cancel: CancellationToken::default(),
            gate: Gate::default(),
-            pagestream_throttle: Arc::new(throttle::Throttle::new(
-                Tenant::get_pagestream_throttle_config(conf, &attached_conf.tenant_conf),
-                crate::metrics::tenant_throttling::Metrics::new(&tenant_shard_id),
+            timeline_get_throttle: Arc::new(throttle::Throttle::new(
+                Tenant::get_timeline_get_throttle_config(conf, &attached_conf.tenant_conf),
+                crate::metrics::tenant_throttling::TimelineGet::new(&tenant_shard_id),
            )),
            tenant_conf: Arc::new(ArcSwap::from_pointee(attached_conf)),
            ongoing_timeline_detach: std::sync::Mutex::default(),
@@ -4909,7 +4909,7 @@ impl Tenant {
    fn build_timeline_resources(&self, timeline_id: TimelineId) -> TimelineResources {
        TimelineResources {
            remote_client: self.build_timeline_remote_client(timeline_id),
-            pagestream_throttle: self.pagestream_throttle.clone(),
+            timeline_get_throttle: self.timeline_get_throttle.clone(),
            l0_flush_global_state: self.l0_flush_global_state.clone(),
        }
    }
--- a/pageserver/src/tenant/ephemeral_file.rs
+++ b/pageserver/src/tenant/ephemeral_file.rs
@@ -8,8 +8,10 @@ use crate::page_cache;
 use crate::tenant::storage_layer::inmemory_layer::vectored_dio_read::File;
 use crate::virtual_file::owned_buffers_io::io_buf_aligned::IoBufAlignedMut;
 use crate::virtual_file::owned_buffers_io::slice::SliceMutExt;
+use crate::virtual_file::owned_buffers_io::util::size_tracking_writer;
 use crate::virtual_file::owned_buffers_io::write::Buffer;
 use crate::virtual_file::{self, owned_buffers_io, IoBufferMut, VirtualFile};
+use bytes::BytesMut;
 use camino::Utf8PathBuf;
 use num_traits::Num;
 use pageserver_api::shard::TenantShardId;
@@ -18,7 +20,6 @@ use tracing::error;

 use std::io;
 use std::sync::atomic::AtomicU64;
-use std::sync::Arc;
 use utils::id::TimelineId;

 pub struct EphemeralFile {
@@ -26,7 +27,10 @@ pub struct EphemeralFile {
    _timeline_id: TimelineId,
    page_cache_file_id: page_cache::FileId,
    bytes_written: u64,
-    buffered_writer: owned_buffers_io::write::BufferedWriter<IoBufferMut, VirtualFile>,
+    buffered_writer: owned_buffers_io::write::BufferedWriter<
+        BytesMut,
+        size_tracking_writer::Writer<VirtualFile>,
+    >,
    /// Gate guard is held on as long as we need to do operations in the path (delete on drop)
    _gate_guard: utils::sync::gate::GateGuard,
 }
@@ -38,9 +42,9 @@ impl EphemeralFile {
        conf: &PageServerConf,
        tenant_shard_id: TenantShardId,
        timeline_id: TimelineId,
-        gate: &utils::sync::gate::Gate,
+        gate_guard: utils::sync::gate::GateGuard,
        ctx: &RequestContext,
-    ) -> anyhow::Result<EphemeralFile> {
+    ) -> Result<EphemeralFile, io::Error> {
        static NEXT_FILENAME: AtomicU64 = AtomicU64::new(1);
        let filename_disambiguator =
            NEXT_FILENAME.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
@@ -51,17 +55,15 @@ impl EphemeralFile {
                "ephemeral-{filename_disambiguator}"
            )));

-        let file = Arc::new(
-            VirtualFile::open_with_options_v2(
-                &filename,
-                virtual_file::OpenOptions::new()
-                    .read(true)
-                    .write(true)
-                    .create(true),
-                ctx,
-            )
-            .await?,
-        );
+        let file = VirtualFile::open_with_options(
+            &filename,
+            virtual_file::OpenOptions::new()
+                .read(true)
+                .write(true)
+                .create(true),
+            ctx,
+        )
+        .await?;

        let page_cache_file_id = page_cache::next_file_id(); // XXX get rid, we're not page-caching anymore

@@ -71,12 +73,10 @@ impl EphemeralFile {
            page_cache_file_id,
            bytes_written: 0,
            buffered_writer: owned_buffers_io::write::BufferedWriter::new(
-                file,
-                || IoBufferMut::with_capacity(TAIL_SZ),
-                gate.enter()?,
-                ctx,
+                size_tracking_writer::Writer::new(file),
+                BytesMut::with_capacity(TAIL_SZ),
            ),
-            _gate_guard: gate.enter()?,
+            _gate_guard: gate_guard,
        })
    }
 }
@@ -85,7 +85,7 @@ impl Drop for EphemeralFile {
    fn drop(&mut self) {
        // unlink the file
        // we are clear to do this, because we have entered a gate
-        let path = self.buffered_writer.as_inner().path();
+        let path = self.buffered_writer.as_inner().as_inner().path();
        let res = std::fs::remove_file(path);
        if let Err(e) = res {
            if e.kind() != std::io::ErrorKind::NotFound {
@@ -132,18 +132,6 @@ impl EphemeralFile {
        srcbuf: &[u8],
        ctx: &RequestContext,
    ) -> std::io::Result<u64> {
-        let (pos, control) = self.write_raw_controlled(srcbuf, ctx).await?;
-        if let Some(control) = control {
-            control.release().await;
-        }
-        Ok(pos)
-    }
-
-    async fn write_raw_controlled(
-        &mut self,
-        srcbuf: &[u8],
-        ctx: &RequestContext,
-    ) -> std::io::Result<(u64, Option<owned_buffers_io::write::FlushControl>)> {
        let pos = self.bytes_written;

        let new_bytes_written = pos.checked_add(srcbuf.len().into_u64()).ok_or_else(|| {
@@ -157,9 +145,9 @@ impl EphemeralFile {
        })?;

        // Write the payload
-        let (nwritten, control) = self
+        let nwritten = self
            .buffered_writer
-            .write_buffered_borrowed_controlled(srcbuf, ctx)
+            .write_buffered_borrowed(srcbuf, ctx)
            .await?;
        assert_eq!(
            nwritten,
@@ -169,7 +157,7 @@ impl EphemeralFile {

        self.bytes_written = new_bytes_written;

-        Ok((pos, control))
+        Ok(pos)
    }
 }

@@ -180,12 +168,11 @@ impl super::storage_layer::inmemory_layer::vectored_dio_read::File for Ephemeral
        dst: tokio_epoll_uring::Slice<B>,
        ctx: &'a RequestContext,
    ) -> std::io::Result<(tokio_epoll_uring::Slice<B>, usize)> {
-        let submitted_offset = self.buffered_writer.bytes_submitted();
+        let file_size_tracking_writer = self.buffered_writer.as_inner();
+        let flushed_offset = file_size_tracking_writer.bytes_written();

-        let mutable = self.buffered_writer.inspect_mutable();
-        let mutable = &mutable[0..mutable.pending()];
-
-        let maybe_flushed = self.buffered_writer.inspect_maybe_flushed();
+        let buffer = self.buffered_writer.inspect_buffer();
+        let buffered = &buffer[0..buffer.pending()];

        let dst_cap = dst.bytes_total().into_u64();
        let end = {
@@ -210,42 +197,11 @@ impl super::storage_layer::inmemory_layer::vectored_dio_read::File for Ephemeral
                }
            }
        }
-
-        let (written_range, maybe_flushed_range) = {
-            if maybe_flushed.is_some() {
-                // [       written       ][ maybe_flushed ][    mutable    ]
-                //                        <-   TAIL_SZ   -><-   TAIL_SZ   ->
-                //                                         ^
-                //                                 `submitted_offset`
-                // <++++++ on disk +++++++????????????????>
-                (
-                    Range(
-                        start,
-                        std::cmp::min(end, submitted_offset.saturating_sub(TAIL_SZ as u64)),
-                    ),
-                    Range(
-                        std::cmp::max(start, submitted_offset.saturating_sub(TAIL_SZ as u64)),
-                        std::cmp::min(end, submitted_offset),
-                    ),
-                )
-            } else {
-                // [       written                        ][    mutable    ]
-                //                                         <-   TAIL_SZ   ->
-                //                                         ^
-                //                                 `submitted_offset`
-                // <++++++ on disk +++++++++++++++++++++++>
-                (
-                    Range(start, std::cmp::min(end, submitted_offset)),
-                    // zero len
-                    Range(submitted_offset, u64::MIN),
-                )
-            }
-        };
-
-        let mutable_range = Range(std::cmp::max(start, submitted_offset), end);
+        let written_range = Range(start, std::cmp::min(end, flushed_offset));
+        let buffered_range = Range(std::cmp::max(start, flushed_offset), end);

        let dst = if written_range.len() > 0 {
-            let file: &VirtualFile = self.buffered_writer.as_inner();
+            let file: &VirtualFile = file_size_tracking_writer.as_inner();
            let bounds = dst.bounds();
            let slice = file
                .read_exact_at(dst.slice(0..written_range.len().into_usize()), start, ctx)
@@ -255,21 +211,19 @@ impl super::storage_layer::inmemory_layer::vectored_dio_read::File for Ephemeral
            dst
        };

-        let dst = if maybe_flushed_range.len() > 0 {
-            let offset_in_buffer = maybe_flushed_range
+        let dst = if buffered_range.len() > 0 {
+            let offset_in_buffer = buffered_range
                .0
-                .checked_sub(submitted_offset.saturating_sub(TAIL_SZ as u64))
+                .checked_sub(flushed_offset)
                .unwrap()
                .into_usize();
-            // Checked previously the buffer is Some.
-            let maybe_flushed = maybe_flushed.unwrap();
-            let to_copy = &maybe_flushed
-                [offset_in_buffer..(offset_in_buffer + maybe_flushed_range.len().into_usize())];
+            let to_copy =
+                &buffered[offset_in_buffer..(offset_in_buffer + buffered_range.len().into_usize())];
            let bounds = dst.bounds();
            let mut view = dst.slice({
                let start = written_range.len().into_usize();
                let end = start
-                    .checked_add(maybe_flushed_range.len().into_usize())
+                    .checked_add(buffered_range.len().into_usize())
                    .unwrap();
                start..end
            });
@@ -280,28 +234,6 @@ impl super::storage_layer::inmemory_layer::vectored_dio_read::File for Ephemeral
            dst
        };

-        let dst = if mutable_range.len() > 0 {
-            let offset_in_buffer = mutable_range
-                .0
-                .checked_sub(submitted_offset)
-                .unwrap()
-                .into_usize();
-            let to_copy =
-                &mutable[offset_in_buffer..(offset_in_buffer + mutable_range.len().into_usize())];
-            let bounds = dst.bounds();
-            let mut view = dst.slice({
-                let start =
-                    written_range.len().into_usize() + maybe_flushed_range.len().into_usize();
-                let end = start.checked_add(mutable_range.len().into_usize()).unwrap();
-                start..end
-            });
-            view.as_mut_rust_slice_full_zeroed()
-                .copy_from_slice(to_copy);
-            Slice::from_buf_bounds(Slice::into_inner(view), bounds)
-        } else {
-            dst
-        };
-
        // TODO: in debug mode, randomize the remaining bytes in `dst` to catch bugs

        Ok((dst, (end - start).into_usize()))
@@ -363,7 +295,7 @@ mod tests {

        let gate = utils::sync::gate::Gate::default();

-        let file = EphemeralFile::create(conf, tenant_id, timeline_id, &gate, &ctx)
+        let file = EphemeralFile::create(conf, tenant_id, timeline_id, gate.enter().unwrap(), &ctx)
            .await
            .unwrap();

@@ -394,15 +326,14 @@ mod tests {

        let gate = utils::sync::gate::Gate::default();

-        let mut file = EphemeralFile::create(conf, tenant_id, timeline_id, &gate, &ctx)
-            .await
-            .unwrap();
+        let mut file =
+            EphemeralFile::create(conf, tenant_id, timeline_id, gate.enter().unwrap(), &ctx)
+                .await
+                .unwrap();

-        let mutable = file.buffered_writer.inspect_mutable();
-        let cap = mutable.capacity();
-        let align = mutable.align();
+        let cap = file.buffered_writer.inspect_buffer().capacity();

-        let write_nbytes = cap * 2 + cap / 2;
+        let write_nbytes = cap + cap / 2;

        let content: Vec<u8> = rand::thread_rng()
            .sample_iter(rand::distributions::Standard)
@@ -410,39 +341,30 @@ mod tests {
            .collect();

        let mut value_offsets = Vec::new();
-        for range in (0..write_nbytes)
-            .step_by(align)
-            .map(|start| start..(start + align).min(write_nbytes))
-        {
-            let off = file.write_raw(&content[range], &ctx).await.unwrap();
+        for i in 0..write_nbytes {
+            let off = file.write_raw(&content[i..i + 1], &ctx).await.unwrap();
            value_offsets.push(off);
        }

-        assert_eq!(file.len() as usize, write_nbytes);
-        for (i, range) in (0..write_nbytes)
-            .step_by(align)
-            .map(|start| start..(start + align).min(write_nbytes))
-            .enumerate()
-        {
-            assert_eq!(value_offsets[i], range.start.into_u64());
-            let buf = IoBufferMut::with_capacity(range.len());
+        assert!(file.len() as usize == write_nbytes);
+        for i in 0..write_nbytes {
+            assert_eq!(value_offsets[i], i.into_u64());
+            let buf = IoBufferMut::with_capacity(1);
            let (buf_slice, nread) = file
-                .read_exact_at_eof_ok(range.start.into_u64(), buf.slice_full(), &ctx)
+                .read_exact_at_eof_ok(i.into_u64(), buf.slice_full(), &ctx)
                .await
                .unwrap();
            let buf = buf_slice.into_inner();
-            assert_eq!(nread, range.len());
-            assert_eq!(&buf, &content[range]);
+            assert_eq!(nread, 1);
+            assert_eq!(&buf, &content[i..i + 1]);
        }

-        let file_contents = std::fs::read(file.buffered_writer.as_inner().path()).unwrap();
-        assert!(file_contents == content[0..cap * 2]);
+        let file_contents =
+            std::fs::read(file.buffered_writer.as_inner().as_inner().path()).unwrap();
+        assert_eq!(file_contents, &content[0..cap]);

-        let maybe_flushed_buffer_contents = file.buffered_writer.inspect_maybe_flushed().unwrap();
-        assert_eq!(&maybe_flushed_buffer_contents[..], &content[cap..cap * 2]);
-
-        let mutable_buffer_contents = file.buffered_writer.inspect_mutable();
-        assert_eq!(mutable_buffer_contents, &content[cap * 2..write_nbytes]);
+        let buffer_contents = file.buffered_writer.inspect_buffer();
+        assert_eq!(buffer_contents, &content[cap..write_nbytes]);
    }

    #[tokio::test]
@@ -451,16 +373,16 @@ mod tests {

        let gate = utils::sync::gate::Gate::default();

-        let mut file = EphemeralFile::create(conf, tenant_id, timeline_id, &gate, &ctx)
-            .await
-            .unwrap();
+        let mut file =
+            EphemeralFile::create(conf, tenant_id, timeline_id, gate.enter().unwrap(), &ctx)
+                .await
+                .unwrap();

-        // mutable buffer and maybe_flushed buffer each has `cap` bytes.
-        let cap = file.buffered_writer.inspect_mutable().capacity();
+        let cap = file.buffered_writer.inspect_buffer().capacity();

        let content: Vec<u8> = rand::thread_rng()
            .sample_iter(rand::distributions::Standard)
-            .take(cap * 2 + cap / 2)
+            .take(cap + cap / 2)
            .collect();

        file.write_raw(&content, &ctx).await.unwrap();
@@ -468,21 +390,23 @@ mod tests {
        // assert the state is as this test expects it to be
        assert_eq!(
            &file.load_to_io_buf(&ctx).await.unwrap(),
-            &content[0..cap * 2 + cap / 2]
+            &content[0..cap + cap / 2]
        );
-        let md = file.buffered_writer.as_inner().path().metadata().unwrap();
+        let md = file
+            .buffered_writer
+            .as_inner()
+            .as_inner()
+            .path()
+            .metadata()
+            .unwrap();
        assert_eq!(
            md.len(),
-            2 * cap.into_u64(),
-            "buffered writer requires one write to be flushed if we write 2.5x buffer capacity"
+            cap.into_u64(),
+            "buffered writer does one write if we write 1.5x buffer capacity"
        );
        assert_eq!(
-            &file.buffered_writer.inspect_maybe_flushed().unwrap()[0..cap],
-            &content[cap..cap * 2]
-        );
-        assert_eq!(
-            &file.buffered_writer.inspect_mutable()[0..cap / 2],
-            &content[cap * 2..cap * 2 + cap / 2]
+            &file.buffered_writer.inspect_buffer()[0..cap / 2],
+            &content[cap..cap + cap / 2]
        );
    }

@@ -498,19 +422,19 @@ mod tests {

        let gate = utils::sync::gate::Gate::default();

-        let mut file = EphemeralFile::create(conf, tenant_id, timeline_id, &gate, &ctx)
-            .await
-            .unwrap();
+        let mut file =
+            EphemeralFile::create(conf, tenant_id, timeline_id, gate.enter().unwrap(), &ctx)
+                .await
+                .unwrap();
+
+        let cap = file.buffered_writer.inspect_buffer().capacity();

-        let mutable = file.buffered_writer.inspect_mutable();
-        let cap = mutable.capacity();
-        let align = mutable.align();
        let content: Vec<u8> = rand::thread_rng()
            .sample_iter(rand::distributions::Standard)
-            .take(cap * 2 + cap / 2)
+            .take(cap + cap / 2)
            .collect();

-        let (_, control) = file.write_raw_controlled(&content, &ctx).await.unwrap();
+        file.write_raw(&content, &ctx).await.unwrap();

        let test_read = |start: usize, len: usize| {
            let file = &file;
@@ -530,38 +454,16 @@ mod tests {
            }
        };

-        let test_read_all_offset_combinations = || {
-            async move {
-                test_read(align, align).await;
-                // border onto edge of file
-                test_read(cap - align, align).await;
-                // read across file and buffer
-                test_read(cap - align, 2 * align).await;
-                // stay from start of maybe flushed buffer
-                test_read(cap, align).await;
-                // completely within maybe flushed buffer
-                test_read(cap + align, align).await;
-                // border onto edge of maybe flushed buffer.
-                test_read(cap * 2 - align, align).await;
-                // read across maybe flushed and mutable buffer
-                test_read(cap * 2 - align, 2 * align).await;
-                // read across three segments
-                test_read(cap - align, cap + 2 * align).await;
-                // completely within mutable buffer
-                test_read(cap * 2 + align, align).await;
-            }
-        };
-
        // completely within the file range
-        assert!(align < cap, "test assumption");
-        assert!(cap % align == 0);
-
-        // test reads at different flush stages.
-        let not_started = control.unwrap().into_not_started();
-        test_read_all_offset_combinations().await;
-        let in_progress = not_started.ready_to_flush();
-        test_read_all_offset_combinations().await;
-        in_progress.wait_until_flush_is_done().await;
-        test_read_all_offset_combinations().await;
+        assert!(20 < cap, "test assumption");
+        test_read(10, 10).await;
+        // border onto edge of file
+        test_read(cap - 10, 10).await;
+        // read across file and buffer
+        test_read(cap - 10, 20).await;
+        // stay from start of buffer
+        test_read(cap, 10).await;
+        // completely within buffer
+        test_read(cap + 10, 10).await;
    }
 }
--- a/pageserver/src/tenant/mgr.rs
+++ b/pageserver/src/tenant/mgr.rs
@@ -347,7 +347,7 @@ async fn init_load_generations(
        );
        emergency_generations(tenant_confs)
    } else if let Some(client) = ControllerUpcallClient::new(conf, cancel) {
-        info!("Calling {} API to re-attach tenants", client.base_url());
+        info!("Calling control plane API to re-attach tenants");
        // If we are configured to use the control plane API, then it is the source of truth for what tenants to load.
        match client.re_attach(conf).await {
            Ok(tenants) => tenants
@@ -894,7 +894,7 @@ impl TenantManager {
            Some(TenantSlot::Attached(tenant)) => Ok(Arc::clone(tenant)),
            Some(TenantSlot::InProgress(_)) => Err(GetTenantError::NotActive(tenant_shard_id)),
            None | Some(TenantSlot::Secondary(_)) => {
-                Err(GetTenantError::ShardNotFound(tenant_shard_id))
+                Err(GetTenantError::NotFound(tenant_shard_id.tenant_id))
            }
        }
    }
@@ -2258,9 +2258,6 @@ pub(crate) enum GetTenantError {
    #[error("Tenant {0} not found")]
    NotFound(TenantId),

-    #[error("Tenant {0} not found")]
-    ShardNotFound(TenantShardId),
-
    #[error("Tenant {0} is not active")]
    NotActive(TenantShardId),

--- a/pageserver/src/tenant/remote_timeline_client.rs
+++ b/pageserver/src/tenant/remote_timeline_client.rs
@@ -681,7 +681,6 @@ impl RemoteTimelineClient {
        layer_file_name: &LayerName,
        layer_metadata: &LayerFileMetadata,
        local_path: &Utf8Path,
-        gate: &utils::sync::gate::Gate,
        cancel: &CancellationToken,
        ctx: &RequestContext,
    ) -> Result<u64, DownloadError> {
@@ -701,7 +700,6 @@ impl RemoteTimelineClient {
                layer_file_name,
                layer_metadata,
                local_path,
-                gate,
                cancel,
                ctx,
            )
@@ -2566,9 +2564,9 @@ pub fn parse_remote_index_path(path: RemotePath) -> Option<Generation> {
 }

 /// Given the key of a tenant manifest, parse out the generation number
-pub fn parse_remote_tenant_manifest_path(path: RemotePath) -> Option<Generation> {
+pub(crate) fn parse_remote_tenant_manifest_path(path: RemotePath) -> Option<Generation> {
    static RE: OnceLock<Regex> = OnceLock::new();
-    let re = RE.get_or_init(|| Regex::new(r".*tenant-manifest-([0-9a-f]{8}).json").unwrap());
+    let re = RE.get_or_init(|| Regex::new(r".+tenant-manifest-([0-9a-f]{8}).json").unwrap());
    re.captures(path.get_path().as_str())
        .and_then(|c| c.get(1))
        .and_then(|m| Generation::parse_suffix(m.as_str()))
--- a/pageserver/src/tenant/remote_timeline_client/download.rs
+++ b/pageserver/src/tenant/remote_timeline_client/download.rs
@@ -26,6 +26,8 @@ use crate::span::{
 use crate::tenant::remote_timeline_client::{remote_layer_path, remote_timelines_path};
 use crate::tenant::storage_layer::LayerName;
 use crate::tenant::Generation;
+#[cfg_attr(target_os = "macos", allow(unused_imports))]
+use crate::virtual_file::owned_buffers_io::io_buf_ext::IoBufExt;
 use crate::virtual_file::{on_fatal_io_error, MaybeFatalIo, VirtualFile};
 use crate::TEMP_FILE_SUFFIX;
 use remote_storage::{
@@ -58,7 +60,6 @@ pub async fn download_layer_file<'a>(
    layer_file_name: &'a LayerName,
    layer_metadata: &'a LayerFileMetadata,
    local_path: &Utf8Path,
-    gate: &utils::sync::gate::Gate,
    cancel: &CancellationToken,
    ctx: &RequestContext,
 ) -> Result<u64, DownloadError> {
@@ -87,9 +88,7 @@ pub async fn download_layer_file<'a>(
    let temp_file_path = path_with_suffix_extension(local_path, TEMP_DOWNLOAD_EXTENSION);

    let bytes_amount = download_retry(
-        || async {
-            download_object(storage, &remote_path, &temp_file_path, gate, cancel, ctx).await
-        },
+        || async { download_object(storage, &remote_path, &temp_file_path, cancel, ctx).await },
        &format!("download {remote_path:?}"),
        cancel,
    )
@@ -149,7 +148,6 @@ async fn download_object<'a>(
    storage: &'a GenericRemoteStorage,
    src_path: &RemotePath,
    dst_path: &Utf8PathBuf,
-    #[cfg_attr(target_os = "macos", allow(unused_variables))] gate: &utils::sync::gate::Gate,
    cancel: &CancellationToken,
    #[cfg_attr(target_os = "macos", allow(unused_variables))] ctx: &RequestContext,
 ) -> Result<u64, DownloadError> {
@@ -207,18 +205,13 @@ async fn download_object<'a>(
        }
        #[cfg(target_os = "linux")]
        crate::virtual_file::io_engine::IoEngine::TokioEpollUring => {
-            use crate::virtual_file::owned_buffers_io;
-            use crate::virtual_file::IoBufferMut;
-            use std::sync::Arc;
+            use crate::virtual_file::owned_buffers_io::{self, util::size_tracking_writer};
+            use bytes::BytesMut;
            async {
-                let destination_file = Arc::new(
-                    VirtualFile::create(dst_path, ctx)
-                        .await
-                        .with_context(|| {
-                            format!("create a destination file for layer '{dst_path}'")
-                        })
-                        .map_err(DownloadError::Other)?,
-                );
+                let destination_file = VirtualFile::create(dst_path, ctx)
+                    .await
+                    .with_context(|| format!("create a destination file for layer '{dst_path}'"))
+                    .map_err(DownloadError::Other)?;

                let mut download = storage
                    .download(src_path, &DownloadOpts::default(), cancel)
@@ -226,16 +219,14 @@ async fn download_object<'a>(

                pausable_failpoint!("before-downloading-layer-stream-pausable");

-                let mut buffered = owned_buffers_io::write::BufferedWriter::<IoBufferMut, _>::new(
-                    destination_file,
-                    || IoBufferMut::with_capacity(super::BUFFER_SIZE),
-                    gate.enter().map_err(|_| DownloadError::Cancelled)?,
-                    ctx,
-                );
-
                // TODO: use vectored write (writev) once supported by tokio-epoll-uring.
                // There's chunks_vectored() on the stream.
                let (bytes_amount, destination_file) = async {
+                    let size_tracking = size_tracking_writer::Writer::new(destination_file);
+                    let mut buffered = owned_buffers_io::write::BufferedWriter::<BytesMut, _>::new(
+                        size_tracking,
+                        BytesMut::with_capacity(super::BUFFER_SIZE),
+                    );
                    while let Some(res) =
                        futures::StreamExt::next(&mut download.download_stream).await
                    {
@@ -243,10 +234,10 @@ async fn download_object<'a>(
                            Ok(chunk) => chunk,
                            Err(e) => return Err(e),
                        };
-                        buffered.write_buffered_borrowed(&chunk, ctx).await?;
+                        buffered.write_buffered(chunk.slice_len(), ctx).await?;
                    }
-                    let inner = buffered.flush_and_into_inner(ctx).await?;
-                    Ok(inner)
+                    let size_tracking = buffered.flush_and_into_inner(ctx).await?;
+                    Ok(size_tracking.into_inner())
                }
                .await?;

--- a/pageserver/src/tenant/remote_timeline_client/manifest.rs
+++ b/pageserver/src/tenant/remote_timeline_client/manifest.rs
@@ -43,7 +43,7 @@ impl TenantManifest {
            offloaded_timelines: vec![],
        }
    }
-    pub fn from_json_bytes(bytes: &[u8]) -> Result<Self, serde_json::Error> {
+    pub(crate) fn from_json_bytes(bytes: &[u8]) -> Result<Self, serde_json::Error> {
        serde_json::from_slice::<Self>(bytes)
    }

--- a/pageserver/src/tenant/secondary.rs
+++ b/pageserver/src/tenant/secondary.rs
@@ -22,7 +22,6 @@ use super::{
    mgr::TenantManager,
    span::debug_assert_current_span_has_tenant_id,
    storage_layer::LayerName,
-    GetTenantError,
 };

 use crate::metrics::SECONDARY_RESIDENT_PHYSICAL_SIZE;
@@ -67,21 +66,7 @@ struct CommandRequest<T> {
 }

 struct CommandResponse {
-    result: Result<(), SecondaryTenantError>,
-}
-
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum SecondaryTenantError {
-    #[error("{0}")]
-    GetTenant(GetTenantError),
-    #[error("shutting down")]
-    ShuttingDown,
-}
-
-impl From<GetTenantError> for SecondaryTenantError {
-    fn from(gte: GetTenantError) -> Self {
-        Self::GetTenant(gte)
-    }
+    result: anyhow::Result<()>,
 }

 // Whereas [`Tenant`] represents an attached tenant, this type represents the work
@@ -300,7 +285,7 @@ impl SecondaryController {
        &self,
        queue: &tokio::sync::mpsc::Sender<CommandRequest<T>>,
        payload: T,
-    ) -> Result<(), SecondaryTenantError> {
+    ) -> anyhow::Result<()> {
        let (response_tx, response_rx) = tokio::sync::oneshot::channel();

        queue
@@ -309,26 +294,20 @@ impl SecondaryController {
                response_tx,
            })
            .await
-            .map_err(|_| SecondaryTenantError::ShuttingDown)?;
+            .map_err(|_| anyhow::anyhow!("Receiver shut down"))?;

        let response = response_rx
            .await
-            .map_err(|_| SecondaryTenantError::ShuttingDown)?;
+            .map_err(|_| anyhow::anyhow!("Request dropped"))?;

        response.result
    }

-    pub(crate) async fn upload_tenant(
-        &self,
-        tenant_shard_id: TenantShardId,
-    ) -> Result<(), SecondaryTenantError> {
+    pub async fn upload_tenant(&self, tenant_shard_id: TenantShardId) -> anyhow::Result<()> {
        self.dispatch(&self.upload_req_tx, UploadCommand::Upload(tenant_shard_id))
            .await
    }
-    pub(crate) async fn download_tenant(
-        &self,
-        tenant_shard_id: TenantShardId,
-    ) -> Result<(), SecondaryTenantError> {
+    pub async fn download_tenant(&self, tenant_shard_id: TenantShardId) -> anyhow::Result<()> {
        self.dispatch(
            &self.download_req_tx,
            DownloadCommand::Download(tenant_shard_id),
--- a/pageserver/src/tenant/secondary/downloader.rs
+++ b/pageserver/src/tenant/secondary/downloader.rs
@@ -35,7 +35,7 @@ use super::{
        self, period_jitter, period_warmup, Completion, JobGenerator, SchedulingResult,
        TenantBackgroundJobs,
    },
-    GetTenantError, SecondaryTenant, SecondaryTenantError,
+    SecondaryTenant,
 };

 use crate::tenant::{
@@ -470,16 +470,15 @@ impl JobGenerator<PendingDownload, RunningDownload, CompleteDownload, DownloadCo
        result
    }

-    fn on_command(
-        &mut self,
-        command: DownloadCommand,
-    ) -> Result<PendingDownload, SecondaryTenantError> {
+    fn on_command(&mut self, command: DownloadCommand) -> anyhow::Result<PendingDownload> {
        let tenant_shard_id = command.get_tenant_shard_id();

        let tenant = self
            .tenant_manager
-            .get_secondary_tenant_shard(*tenant_shard_id)
-            .ok_or(GetTenantError::ShardNotFound(*tenant_shard_id))?;
+            .get_secondary_tenant_shard(*tenant_shard_id);
+        let Some(tenant) = tenant else {
+            return Err(anyhow::anyhow!("Not found or not in Secondary mode"));
+        };

        Ok(PendingDownload {
            target_time: None,
@@ -1183,7 +1182,6 @@ impl<'a> TenantDownloader<'a> {
            &layer.name,
            &layer.metadata,
            &local_path,
-            &self.secondary_state.gate,
            &self.secondary_state.cancel,
            ctx,
        )
--- a/pageserver/src/tenant/secondary/heatmap_uploader.rs
+++ b/pageserver/src/tenant/secondary/heatmap_uploader.rs
@@ -28,7 +28,7 @@ use super::{
        self, period_jitter, period_warmup, JobGenerator, RunningJob, SchedulingResult,
        TenantBackgroundJobs,
    },
-    CommandRequest, SecondaryTenantError, UploadCommand,
+    CommandRequest, UploadCommand,
 };
 use tokio_util::sync::CancellationToken;
 use tracing::{info_span, instrument, Instrument};
@@ -279,10 +279,7 @@ impl JobGenerator<UploadPending, WriteInProgress, WriteComplete, UploadCommand>
        }.instrument(info_span!(parent: None, "heatmap_upload", tenant_id=%tenant_shard_id.tenant_id, shard_id=%tenant_shard_id.shard_slug()))))
    }

-    fn on_command(
-        &mut self,
-        command: UploadCommand,
-    ) -> Result<UploadPending, SecondaryTenantError> {
+    fn on_command(&mut self, command: UploadCommand) -> anyhow::Result<UploadPending> {
        let tenant_shard_id = command.get_tenant_shard_id();

        tracing::info!(
@@ -290,7 +287,8 @@ impl JobGenerator<UploadPending, WriteInProgress, WriteComplete, UploadCommand>
            "Starting heatmap write on command");
        let tenant = self
            .tenant_manager
-            .get_attached_tenant_shard(*tenant_shard_id)?;
+            .get_attached_tenant_shard(*tenant_shard_id)
+            .map_err(|e| anyhow::anyhow!(e))?;
        if !tenant.is_active() {
            return Err(GetTenantError::NotActive(*tenant_shard_id).into());
        }
--- a/pageserver/src/tenant/secondary/scheduler.rs
+++ b/pageserver/src/tenant/secondary/scheduler.rs
@@ -12,7 +12,7 @@ use tokio::task::JoinSet;
 use tokio_util::sync::CancellationToken;
 use utils::{completion::Barrier, yielding_loop::yielding_loop};

-use super::{CommandRequest, CommandResponse, SecondaryTenantError};
+use super::{CommandRequest, CommandResponse};

 /// Scheduling interval is the time between calls to JobGenerator::schedule.
 /// When we schedule jobs, the job generator may provide a hint of its preferred
@@ -112,7 +112,7 @@ where

    /// Called when a command is received.  A job will be spawned immediately if the return
    /// value is Some, ignoring concurrency limits and the pending queue.
-    fn on_command(&mut self, cmd: CMD) -> Result<PJ, SecondaryTenantError>;
+    fn on_command(&mut self, cmd: CMD) -> anyhow::Result<PJ>;
 }

 /// [`JobGenerator`] returns this to provide pending jobs, and hints about scheduling
--- a/pageserver/src/tenant/storage_layer/inmemory_layer.rs
+++ b/pageserver/src/tenant/storage_layer/inmemory_layer.rs
@@ -555,12 +555,13 @@ impl InMemoryLayer {
        timeline_id: TimelineId,
        tenant_shard_id: TenantShardId,
        start_lsn: Lsn,
-        gate: &utils::sync::gate::Gate,
+        gate_guard: utils::sync::gate::GateGuard,
        ctx: &RequestContext,
    ) -> Result<InMemoryLayer> {
        trace!("initializing new empty InMemoryLayer for writing on timeline {timeline_id} at {start_lsn}");

-        let file = EphemeralFile::create(conf, tenant_shard_id, timeline_id, gate, ctx).await?;
+        let file =
+            EphemeralFile::create(conf, tenant_shard_id, timeline_id, gate_guard, ctx).await?;
        let key = InMemoryLayerFileId(file.page_cache_file_id());

        Ok(InMemoryLayer {
--- a/pageserver/src/tenant/storage_layer/layer.rs
+++ b/pageserver/src/tenant/storage_layer/layer.rs
@@ -1149,7 +1149,6 @@ impl LayerInner {
                &self.desc.layer_name(),
                &self.metadata(),
                &self.path,
-                &timeline.gate,
                &timeline.cancel,
                ctx,
            )
--- a/pageserver/src/tenant/tasks.rs
+++ b/pageserver/src/tenant/tasks.rs
@@ -471,14 +471,14 @@ async fn ingest_housekeeping_loop(tenant: Arc<Tenant>, cancel: CancellationToken

            // TODO: rename the background loop kind to something more generic, like, tenant housekeeping.
            // Or just spawn another background loop for this throttle, it's not like it's super costly.
-            info_span!(parent: None, "pagestream_throttle", tenant_id=%tenant.tenant_shard_id, shard_id=%tenant.tenant_shard_id.shard_slug()).in_scope(|| {
+            info_span!(parent: None, "timeline_get_throttle", tenant_id=%tenant.tenant_shard_id, shard_id=%tenant.tenant_shard_id.shard_slug()).in_scope(|| {
                let now = Instant::now();
                let prev = std::mem::replace(&mut last_throttle_flag_reset_at, now);
-                let Stats { count_accounted_start, count_accounted_finish, count_throttled, sum_throttled_usecs} = tenant.pagestream_throttle.reset_stats();
+                let Stats { count_accounted_start, count_accounted_finish, count_throttled, sum_throttled_usecs} = tenant.timeline_get_throttle.reset_stats();
                if count_throttled == 0 {
                    return;
                }
-                let allowed_rps = tenant.pagestream_throttle.steady_rps();
+                let allowed_rps = tenant.timeline_get_throttle.steady_rps();
                let delta = now - prev;
                info!(
                    n_seconds=%format_args!("{:.3}", delta.as_secs_f64()),
--- a/pageserver/src/tenant/throttle.rs
+++ b/pageserver/src/tenant/throttle.rs
@@ -1,14 +1,19 @@
 use std::{
+    str::FromStr,
    sync::{
        atomic::{AtomicU64, Ordering},
-        Arc,
+        Arc, Mutex,
    },
    time::{Duration, Instant},
 };

 use arc_swap::ArcSwap;
+use enumset::EnumSet;
+use tracing::{error, warn};
 use utils::leaky_bucket::{LeakyBucketConfig, RateLimiter};

+use crate::{context::RequestContext, task_mgr::TaskKind};
+
 /// Throttle for `async` functions.
 ///
 /// Runtime reconfigurable.
@@ -30,7 +35,7 @@ pub struct Throttle<M: Metric> {
 }

 pub struct Inner {
-    enabled: bool,
+    task_kinds: EnumSet<TaskKind>,
    rate_limiter: Arc<RateLimiter>,
 }

@@ -74,12 +79,26 @@ where
    }
    fn new_inner(config: Config) -> Inner {
        let Config {
-            enabled,
+            task_kinds,
            initial,
            refill_interval,
            refill_amount,
            max,
        } = config;
+        let task_kinds: EnumSet<TaskKind> = task_kinds
+            .iter()
+            .filter_map(|s| match TaskKind::from_str(s) {
+                Ok(v) => Some(v),
+                Err(e) => {
+                    // TODO: avoid this failure mode
+                    error!(
+                        "cannot parse task kind, ignoring for rate limiting {}",
+                        utils::error::report_compact_sources(&e)
+                    );
+                    None
+                }
+            })
+            .collect();

        // steady rate, we expect `refill_amount` requests per `refill_interval`.
        // dividing gives us the rps.
@@ -93,7 +112,7 @@ where
        let rate_limiter = RateLimiter::with_initial_tokens(config, f64::from(initial_tokens));

        Inner {
-            enabled: enabled.is_enabled(),
+            task_kinds,
            rate_limiter: Arc::new(rate_limiter),
        }
    }
@@ -122,13 +141,11 @@ where
        self.inner.load().rate_limiter.steady_rps()
    }

-    pub async fn throttle(&self, key_count: usize) -> Option<Duration> {
+    pub async fn throttle(&self, ctx: &RequestContext, key_count: usize) -> Option<Duration> {
        let inner = self.inner.load_full(); // clones the `Inner` Arc
-
-        if !inner.enabled {
+        if !inner.task_kinds.contains(ctx.task_kind()) {
            return None;
-        }
-
+        };
        let start = std::time::Instant::now();

        self.metric.accounting_start();
@@ -145,6 +162,19 @@ where
                .fetch_add(wait_time.as_micros() as u64, Ordering::Relaxed);
            let observation = Observation { wait_time };
            self.metric.observe_throttling(&observation);
+            match ctx.micros_spent_throttled.add(wait_time) {
+                Ok(res) => res,
+                Err(error) => {
+                    use once_cell::sync::Lazy;
+                    use utils::rate_limit::RateLimit;
+                    static WARN_RATE_LIMIT: Lazy<Mutex<RateLimit>> =
+                        Lazy::new(|| Mutex::new(RateLimit::new(Duration::from_secs(10))));
+                    let mut guard = WARN_RATE_LIMIT.lock().unwrap();
+                    guard.call(move || {
+                        warn!(error, "error adding time spent throttled; this message is logged at a global rate limit");
+                    });
+                }
+            }
            Some(wait_time)
        } else {
            None
--- a/pageserver/src/tenant/timeline.rs
+++ b/pageserver/src/tenant/timeline.rs
@@ -208,8 +208,8 @@ fn drop_wlock<T>(rlock: tokio::sync::RwLockWriteGuard<'_, T>) {
 /// The outward-facing resources required to build a Timeline
 pub struct TimelineResources {
    pub remote_client: RemoteTimelineClient,
-    pub pagestream_throttle:
-        Arc<crate::tenant::throttle::Throttle<crate::metrics::tenant_throttling::Pagestream>>,
+    pub timeline_get_throttle:
+        Arc<crate::tenant::throttle::Throttle<crate::metrics::tenant_throttling::TimelineGet>>,
    pub l0_flush_global_state: l0_flush::L0FlushGlobalState,
 }

@@ -411,9 +411,9 @@ pub struct Timeline {
    /// Timeline deletion will acquire both compaction and gc locks in whatever order.
    gc_lock: tokio::sync::Mutex<()>,

-    /// Cloned from [`super::Tenant::pagestream_throttle`] on construction.
-    pub(crate) pagestream_throttle:
-        Arc<crate::tenant::throttle::Throttle<crate::metrics::tenant_throttling::Pagestream>>,
+    /// Cloned from [`super::Tenant::timeline_get_throttle`] on construction.
+    timeline_get_throttle:
+        Arc<crate::tenant::throttle::Throttle<crate::metrics::tenant_throttling::TimelineGet>>,

    /// Size estimator for aux file v2
    pub(crate) aux_file_size_estimator: AuxFileSizeEstimator,
@@ -949,7 +949,7 @@ impl Timeline {
    /// If a remote layer file is needed, it is downloaded as part of this
    /// call.
    ///
-    /// This method enforces [`Self::pagestream_throttle`] internally.
+    /// This method enforces [`Self::timeline_get_throttle`] internally.
    ///
    /// NOTE: It is considered an error to 'get' a key that doesn't exist. The
    /// abstraction above this needs to store suitable metadata to track what
@@ -977,6 +977,8 @@ impl Timeline {
        // page_service.
        debug_assert!(!self.shard_identity.is_key_disposable(&key));

+        self.timeline_get_throttle.throttle(ctx, 1).await;
+
        let keyspace = KeySpace {
            ranges: vec![key..key.next()],
        };
@@ -1056,6 +1058,13 @@ impl Timeline {
            .for_task_kind(ctx.task_kind())
            .map(|metric| (metric, Instant::now()));

+        // start counting after throttle so that throttle time
+        // is always less than observation time
+        let throttled = self
+            .timeline_get_throttle
+            .throttle(ctx, key_count as usize)
+            .await;
+
        let res = self
            .get_vectored_impl(
                keyspace.clone(),
@@ -1067,7 +1076,23 @@ impl Timeline {

        if let Some((metric, start)) = start {
            let elapsed = start.elapsed();
-            metric.observe(elapsed.as_secs_f64());
+            let ex_throttled = if let Some(throttled) = throttled {
+                elapsed.checked_sub(throttled)
+            } else {
+                Some(elapsed)
+            };
+
+            if let Some(ex_throttled) = ex_throttled {
+                metric.observe(ex_throttled.as_secs_f64());
+            } else {
+                use utils::rate_limit::RateLimit;
+                static LOGGED: Lazy<Mutex<RateLimit>> =
+                    Lazy::new(|| Mutex::new(RateLimit::new(Duration::from_secs(10))));
+                let mut rate_limit = LOGGED.lock().unwrap();
+                rate_limit.call(|| {
+                    warn!("error deducting time spent throttled; this message is logged at a global rate limit");
+                });
+            }
        }

        res
@@ -1112,6 +1137,14 @@ impl Timeline {
            .for_task_kind(ctx.task_kind())
            .map(ScanLatencyOngoingRecording::start_recording);

+        // start counting after throttle so that throttle time
+        // is always less than observation time
+        let throttled = self
+            .timeline_get_throttle
+            // assume scan = 1 quota for now until we find a better way to process this
+            .throttle(ctx, 1)
+            .await;
+
        let vectored_res = self
            .get_vectored_impl(
                keyspace.clone(),
@@ -1122,7 +1155,7 @@ impl Timeline {
            .await;

        if let Some(recording) = start {
-            recording.observe();
+            recording.observe(throttled);
        }

        vectored_res
@@ -2338,7 +2371,7 @@ impl Timeline {

                standby_horizon: AtomicLsn::new(0),

-                pagestream_throttle: resources.pagestream_throttle,
+                timeline_get_throttle: resources.timeline_get_throttle,

                aux_file_size_estimator: AuxFileSizeEstimator::new(aux_file_metrics),

@@ -3455,6 +3488,7 @@ impl Timeline {
        ctx: &RequestContext,
    ) -> anyhow::Result<Arc<InMemoryLayer>> {
        let mut guard = self.layers.write().await;
+        let gate_guard = self.gate.enter().context("enter gate for inmem layer")?;

        let last_record_lsn = self.get_last_record_lsn();
        ensure!(
@@ -3471,7 +3505,7 @@ impl Timeline {
                self.conf,
                self.timeline_id,
                self.tenant_shard_id,
-                &self.gate,
+                gate_guard,
                ctx,
            )
            .await?;
--- a/pageserver/src/tenant/timeline/delete.rs
+++ b/pageserver/src/tenant/timeline/delete.rs
@@ -298,7 +298,7 @@ impl DeleteTimelineFlow {
                None, // Ancestor is not needed for deletion.
                TimelineResources {
                    remote_client,
-                    pagestream_throttle: tenant.pagestream_throttle.clone(),
+                    timeline_get_throttle: tenant.timeline_get_throttle.clone(),
                    l0_flush_global_state: tenant.l0_flush_global_state.clone(),
                },
                // Important. We dont pass ancestor above because it can be missing.
--- a/pageserver/src/tenant/timeline/import_pgdata/flow.rs
+++ b/pageserver/src/tenant/timeline/import_pgdata/flow.rs
@@ -129,23 +129,22 @@ impl Flow {
        }

        // Import SLRUs
-        if self.timeline.tenant_shard_id.is_shard_zero() {
-            // pg_xact (01:00 keyspace)
-            self.import_slru(SlruKind::Clog, &self.storage.pgdata().join("pg_xact"))
-                .await?;
-            // pg_multixact/members (01:01 keyspace)
-            self.import_slru(
-                SlruKind::MultiXactMembers,
-                &self.storage.pgdata().join("pg_multixact/members"),
-            )
+
+        // pg_xact (01:00 keyspace)
+        self.import_slru(SlruKind::Clog, &self.storage.pgdata().join("pg_xact"))
            .await?;
-            // pg_multixact/offsets (01:02 keyspace)
-            self.import_slru(
-                SlruKind::MultiXactOffsets,
-                &self.storage.pgdata().join("pg_multixact/offsets"),
-            )
-            .await?;
-        }
+        // pg_multixact/members (01:01 keyspace)
+        self.import_slru(
+            SlruKind::MultiXactMembers,
+            &self.storage.pgdata().join("pg_multixact/members"),
+        )
+        .await?;
+        // pg_multixact/offsets (01:02 keyspace)
+        self.import_slru(
+            SlruKind::MultiXactOffsets,
+            &self.storage.pgdata().join("pg_multixact/offsets"),
+        )
+        .await?;

        // Import pg_twophase.
        // TODO: as empty
@@ -303,8 +302,6 @@ impl Flow {
    }

    async fn import_slru(&mut self, kind: SlruKind, path: &RemotePath) -> anyhow::Result<()> {
-        assert!(self.timeline.tenant_shard_id.is_shard_zero());
-
        let segments = self.storage.listfilesindir(path).await?;
        let segments: Vec<(String, u32, usize)> = segments
            .into_iter()
@@ -340,6 +337,7 @@ impl Flow {
            debug!(%p, segno=%segno, %size, %start_key, %end_key, "scheduling SLRU segment");
            self.tasks
                .push(AnyImportTask::SlruBlocks(ImportSlruBlocksTask::new(
+                    *self.timeline.get_shard_identity(),
                    start_key..end_key,
                    &p,
                    self.storage.clone(),
@@ -633,14 +631,21 @@ impl ImportTask for ImportRelBlocksTask {
 }

 struct ImportSlruBlocksTask {
+    shard_identity: ShardIdentity,
    key_range: Range<Key>,
    path: RemotePath,
    storage: RemoteStorageWrapper,
 }

 impl ImportSlruBlocksTask {
-    fn new(key_range: Range<Key>, path: &RemotePath, storage: RemoteStorageWrapper) -> Self {
+    fn new(
+        shard_identity: ShardIdentity,
+        key_range: Range<Key>,
+        path: &RemotePath,
+        storage: RemoteStorageWrapper,
+    ) -> Self {
        ImportSlruBlocksTask {
+            shard_identity,
            key_range,
            path: path.clone(),
            storage,
@@ -668,13 +673,17 @@ impl ImportTask for ImportSlruBlocksTask {
        let mut file_offset = 0;
        while blknum < end_blk {
            let key = slru_block_to_key(kind, segno, blknum);
+            assert!(
+                !self.shard_identity.is_key_disposable(&key),
+                "SLRU keys need to go into every shard"
+            );
            let buf = &buf[file_offset..(file_offset + 8192)];
            file_offset += 8192;
            layer_writer
                .put_image(key, Bytes::copy_from_slice(buf), ctx)
                .await?;
-            nimages += 1;
            blknum += 1;
+            nimages += 1;
        }
        Ok(nimages)
    }
--- a/pageserver/src/tenant/timeline/layer_manager.rs
+++ b/pageserver/src/tenant/timeline/layer_manager.rs
@@ -182,7 +182,7 @@ impl OpenLayerManager {
        conf: &'static PageServerConf,
        timeline_id: TimelineId,
        tenant_shard_id: TenantShardId,
-        gate: &utils::sync::gate::Gate,
+        gate_guard: utils::sync::gate::GateGuard,
        ctx: &RequestContext,
    ) -> anyhow::Result<Arc<InMemoryLayer>> {
        ensure!(lsn.is_aligned());
@@ -212,9 +212,15 @@ impl OpenLayerManager {
                lsn
            );

-            let new_layer =
-                InMemoryLayer::create(conf, timeline_id, tenant_shard_id, start_lsn, gate, ctx)
-                    .await?;
+            let new_layer = InMemoryLayer::create(
+                conf,
+                timeline_id,
+                tenant_shard_id,
+                start_lsn,
+                gate_guard,
+                ctx,
+            )
+            .await?;
            let layer = Arc::new(new_layer);

            self.layer_map.open_layer = Some(layer.clone());
--- a/pageserver/src/virtual_file.rs
+++ b/pageserver/src/virtual_file.rs
@@ -20,7 +20,7 @@ use camino::{Utf8Path, Utf8PathBuf};
 use once_cell::sync::OnceCell;
 use owned_buffers_io::aligned_buffer::buffer::AlignedBuffer;
 use owned_buffers_io::aligned_buffer::{AlignedBufferMut, AlignedSlice, ConstAlign};
-use owned_buffers_io::io_buf_aligned::{IoBufAligned, IoBufAlignedMut};
+use owned_buffers_io::io_buf_aligned::IoBufAlignedMut;
 use owned_buffers_io::io_buf_ext::FullSlice;
 use pageserver_api::config::defaults::DEFAULT_IO_BUFFER_ALIGNMENT;
 use pageserver_api::shard::TenantShardId;
@@ -63,6 +63,9 @@ pub(crate) mod owned_buffers_io {
    pub(crate) mod io_buf_ext;
    pub(crate) mod slice;
    pub(crate) mod write;
+    pub(crate) mod util {
+        pub(crate) mod size_tracking_writer;
+    }
 }

 #[derive(Debug)]
@@ -218,7 +221,7 @@ impl VirtualFile {
        self.inner.read_exact_at_page(page, offset, ctx).await
    }

-    pub async fn write_all_at<Buf: IoBufAligned + Send>(
+    pub async fn write_all_at<Buf: IoBuf + Send>(
        &self,
        buf: FullSlice<Buf>,
        offset: u64,
@@ -1322,14 +1325,14 @@ impl Drop for VirtualFileInner {
 }

 impl OwnedAsyncWriter for VirtualFile {
-    async fn write_all_at<Buf: IoBufAligned + Send>(
-        &self,
+    #[inline(always)]
+    async fn write_all<Buf: IoBuf + Send>(
+        &mut self,
        buf: FullSlice<Buf>,
-        offset: u64,
        ctx: &RequestContext,
-    ) -> std::io::Result<FullSlice<Buf>> {
-        let (buf, res) = VirtualFile::write_all_at(self, buf, offset, ctx).await;
-        res.map(|_| buf)
+    ) -> std::io::Result<(usize, FullSlice<Buf>)> {
+        let (buf, res) = VirtualFile::write_all(self, buf, ctx).await;
+        res.map(move |v| (v, buf))
    }
 }

@@ -1448,7 +1451,7 @@ mod tests {
                }
            }
        }
-        async fn write_all_at<Buf: IoBufAligned + Send>(
+        async fn write_all_at<Buf: IoBuf + Send>(
            &self,
            buf: FullSlice<Buf>,
            offset: u64,
@@ -1591,7 +1594,6 @@ mod tests {
            &ctx,
        )
        .await?;
-
        file_a
            .write_all(b"foobar".to_vec().slice_len(), &ctx)
            .await?;
@@ -1650,10 +1652,10 @@ mod tests {
        )
        .await?;
        file_b
-            .write_all_at(IoBuffer::from(b"BAR").slice_len(), 3, &ctx)
+            .write_all_at(b"BAR".to_vec().slice_len(), 3, &ctx)
            .await?;
        file_b
-            .write_all_at(IoBuffer::from(b"FOO").slice_len(), 0, &ctx)
+            .write_all_at(b"FOO".to_vec().slice_len(), 0, &ctx)
            .await?;

        assert_eq!(file_b.read_string_at(2, 3, &ctx).await?, "OBA");
--- a/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/alignment.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/alignment.rs
@@ -4,7 +4,7 @@ pub trait Alignment: std::marker::Unpin + 'static {
 }

 /// Alignment at compile time.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug)]
 pub struct ConstAlign<const A: usize>;

 impl<const A: usize> Alignment for ConstAlign<A> {
@@ -14,7 +14,7 @@ impl<const A: usize> Alignment for ConstAlign<A> {
 }

 /// Alignment at run time.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug)]
 pub struct RuntimeAlign {
    align: usize,
 }
--- a/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/buffer.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/buffer.rs
@@ -3,10 +3,9 @@ use std::{
    sync::Arc,
 };

-use super::{alignment::Alignment, raw::RawAlignedBuffer, AlignedBufferMut, ConstAlign};
+use super::{alignment::Alignment, raw::RawAlignedBuffer};

 /// An shared, immutable aligned buffer type.
-#[derive(Clone, Debug)]
 pub struct AlignedBuffer<A: Alignment> {
    /// Shared raw buffer.
    raw: Arc<RawAlignedBuffer<A>>,
@@ -87,13 +86,6 @@ impl<A: Alignment> AlignedBuffer<A> {
            range: begin..end,
        }
    }
-
-    /// Returns the mutable aligned buffer, if the immutable aligned buffer
-    /// has exactly one strong reference. Otherwise returns `None`.
-    pub fn into_mut(self) -> Option<AlignedBufferMut<A>> {
-        let raw = Arc::into_inner(self.raw)?;
-        Some(AlignedBufferMut::from_raw(raw))
-    }
 }

 impl<A: Alignment> Deref for AlignedBuffer<A> {
@@ -116,14 +108,6 @@ impl<A: Alignment> PartialEq<[u8]> for AlignedBuffer<A> {
    }
 }

-impl<const A: usize, const N: usize> From<&[u8; N]> for AlignedBuffer<ConstAlign<A>> {
-    fn from(value: &[u8; N]) -> Self {
-        let mut buf = AlignedBufferMut::with_capacity(N);
-        buf.extend_from_slice(value);
-        buf.freeze()
-    }
-}
-
 /// SAFETY: the underlying buffer references a stable memory region.
 unsafe impl<A: Alignment> tokio_epoll_uring::IoBuf for AlignedBuffer<A> {
    fn stable_ptr(&self) -> *const u8 {
--- a/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/buffer_mut.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/buffer_mut.rs
@@ -1,7 +1,4 @@
-use std::{
-    mem::MaybeUninit,
-    ops::{Deref, DerefMut},
-};
+use std::ops::{Deref, DerefMut};

 use super::{
    alignment::{Alignment, ConstAlign},
@@ -49,11 +46,6 @@ impl<const A: usize> AlignedBufferMut<ConstAlign<A>> {
 }

 impl<A: Alignment> AlignedBufferMut<A> {
-    /// Constructs a mutable aligned buffer from raw.
-    pub(super) fn from_raw(raw: RawAlignedBuffer<A>) -> Self {
-        AlignedBufferMut { raw }
-    }
-
    /// Returns the total number of bytes the buffer can hold.
    #[inline]
    pub fn capacity(&self) -> usize {
@@ -136,39 +128,6 @@ impl<A: Alignment> AlignedBufferMut<A> {
        let len = self.len();
        AlignedBuffer::from_raw(self.raw, 0..len)
    }
-
-    /// Clones and appends all elements in a slice to the buffer. Reserves additional capacity as needed.
-    #[inline]
-    pub fn extend_from_slice(&mut self, extend: &[u8]) {
-        let cnt = extend.len();
-        self.reserve(cnt);
-
-        // SAFETY: we already reserved additional `cnt` bytes, safe to perform memcpy.
-        unsafe {
-            let dst = self.spare_capacity_mut();
-            // Reserved above
-            debug_assert!(dst.len() >= cnt);
-
-            core::ptr::copy_nonoverlapping(extend.as_ptr(), dst.as_mut_ptr().cast(), cnt);
-        }
-        // SAFETY: We do have at least `cnt` bytes remaining before advance.
-        unsafe {
-            bytes::BufMut::advance_mut(self, cnt);
-        }
-    }
-
-    /// Returns the remaining spare capacity of the vector as a slice of `MaybeUninit<u8>`.
-    #[inline]
-    fn spare_capacity_mut(&mut self) -> &mut [MaybeUninit<u8>] {
-        // SAFETY: we guarantees that the `Self::capacity()` bytes from
-        // `Self::as_mut_ptr()` are allocated.
-        unsafe {
-            let ptr = self.as_mut_ptr().add(self.len());
-            let len = self.capacity() - self.len();
-
-            core::slice::from_raw_parts_mut(ptr.cast(), len)
-        }
-    }
 }

 impl<A: Alignment> Deref for AlignedBufferMut<A> {
--- a/pageserver/src/virtual_file/owned_buffers_io/io_buf_aligned.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/io_buf_aligned.rs
@@ -1,15 +1,9 @@
-use tokio_epoll_uring::{IoBuf, IoBufMut};
+use tokio_epoll_uring::IoBufMut;

-use crate::virtual_file::{IoBuffer, IoBufferMut, PageWriteGuardBuf};
+use crate::virtual_file::{IoBufferMut, PageWriteGuardBuf};

-/// A marker trait for a mutable aligned buffer type.
 pub trait IoBufAlignedMut: IoBufMut {}

-/// A marker trait for an aligned buffer type.
-pub trait IoBufAligned: IoBuf {}
-
 impl IoBufAlignedMut for IoBufferMut {}

-impl IoBufAligned for IoBuffer {}
-
 impl IoBufAlignedMut for PageWriteGuardBuf {}
--- a/pageserver/src/virtual_file/owned_buffers_io/io_buf_ext.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/io_buf_ext.rs
@@ -5,8 +5,6 @@ use bytes::{Bytes, BytesMut};
 use std::ops::{Deref, Range};
 use tokio_epoll_uring::{BoundedBuf, IoBuf, Slice};

-use super::write::CheapCloneForRead;
-
 /// The true owned equivalent for Rust [`slice`]. Use this for the write path.
 ///
 /// Unlike [`tokio_epoll_uring::Slice`], which we unfortunately inherited from `tokio-uring`,
@@ -45,18 +43,6 @@ where
    }
 }

-impl<B> CheapCloneForRead for FullSlice<B>
-where
-    B: IoBuf + CheapCloneForRead,
-{
-    fn cheap_clone(&self) -> Self {
-        let bounds = self.slice.bounds();
-        let clone = self.slice.get_ref().cheap_clone();
-        let slice = clone.slice(bounds);
-        Self { slice }
-    }
-}
-
 pub(crate) trait IoBufExt {
    /// Get a [`FullSlice`] for the entire buffer, i.e., `self[..]` or `self[0..self.len()]`.
    fn slice_len(self) -> FullSlice<Self>
--- a/pageserver/src/virtual_file/owned_buffers_io/util/size_tracking_writer.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/util/size_tracking_writer.rs
@@ -0,0 +1,50 @@
+use crate::{
+    context::RequestContext,
+    virtual_file::owned_buffers_io::{io_buf_ext::FullSlice, write::OwnedAsyncWriter},
+};
+use tokio_epoll_uring::IoBuf;
+
+pub struct Writer<W> {
+    dst: W,
+    bytes_amount: u64,
+}
+
+impl<W> Writer<W> {
+    pub fn new(dst: W) -> Self {
+        Self {
+            dst,
+            bytes_amount: 0,
+        }
+    }
+
+    pub fn bytes_written(&self) -> u64 {
+        self.bytes_amount
+    }
+
+    pub fn as_inner(&self) -> &W {
+        &self.dst
+    }
+
+    /// Returns the wrapped `VirtualFile` object as well as the number
+    /// of bytes that were written to it through this object.
+    #[cfg_attr(target_os = "macos", allow(dead_code))]
+    pub fn into_inner(self) -> (u64, W) {
+        (self.bytes_amount, self.dst)
+    }
+}
+
+impl<W> OwnedAsyncWriter for Writer<W>
+where
+    W: OwnedAsyncWriter,
+{
+    #[inline(always)]
+    async fn write_all<Buf: IoBuf + Send>(
+        &mut self,
+        buf: FullSlice<Buf>,
+        ctx: &RequestContext,
+    ) -> std::io::Result<(usize, FullSlice<Buf>)> {
+        let (nwritten, buf) = self.dst.write_all(buf, ctx).await?;
+        self.bytes_amount += u64::try_from(nwritten).unwrap();
+        Ok((nwritten, buf))
+    }
+}
--- a/pageserver/src/virtual_file/owned_buffers_io/write.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/write.rs
@@ -1,88 +1,55 @@
-mod flush;
-use std::sync::Arc;
-
-use flush::FlushHandle;
+use bytes::BytesMut;
 use tokio_epoll_uring::IoBuf;

-use crate::{
-    context::RequestContext,
-    virtual_file::{IoBuffer, IoBufferMut},
-};
+use crate::context::RequestContext;

-use super::{
-    io_buf_aligned::IoBufAligned,
-    io_buf_ext::{FullSlice, IoBufExt},
-};
-
-pub(crate) use flush::FlushControl;
-
-pub(crate) trait CheapCloneForRead {
-    /// Returns a cheap clone of the buffer.
-    fn cheap_clone(&self) -> Self;
-}
-
-impl CheapCloneForRead for IoBuffer {
-    fn cheap_clone(&self) -> Self {
-        // Cheap clone over an `Arc`.
-        self.clone()
-    }
-}
+use super::io_buf_ext::{FullSlice, IoBufExt};

 /// A trait for doing owned-buffer write IO.
 /// Think [`tokio::io::AsyncWrite`] but with owned buffers.
-/// The owned buffers need to be aligned due to Direct IO requirements.
 pub trait OwnedAsyncWriter {
-    fn write_all_at<Buf: IoBufAligned + Send>(
-        &self,
+    async fn write_all<Buf: IoBuf + Send>(
+        &mut self,
        buf: FullSlice<Buf>,
-        offset: u64,
        ctx: &RequestContext,
-    ) -> impl std::future::Future<Output = std::io::Result<FullSlice<Buf>>> + Send;
+    ) -> std::io::Result<(usize, FullSlice<Buf>)>;
 }

 /// A wrapper aorund an [`OwnedAsyncWriter`] that uses a [`Buffer`] to batch
 /// small writes into larger writes of size [`Buffer::cap`].
-// TODO(yuchen): For large write, implementing buffer bypass for aligned parts of the write could be beneficial to throughput,
-// since we would avoid copying majority of the data into the internal buffer.
-pub struct BufferedWriter<B: Buffer, W> {
-    writer: Arc<W>,
+///
+/// # Passthrough Of Large Writers
+///
+/// Calls to [`BufferedWriter::write_buffered`] that are larger than [`Buffer::cap`]
+/// cause the internal buffer to be flushed prematurely so that the large
+/// buffered write is passed through to the underlying [`OwnedAsyncWriter`].
+///
+/// This pass-through is generally beneficial for throughput, but if
+/// the storage backend of the [`OwnedAsyncWriter`] is a shared resource,
+/// unlimited large writes may cause latency or fairness issues.
+///
+/// In such cases, a different implementation that always buffers in memory
+/// may be preferable.
+pub struct BufferedWriter<B, W> {
+    writer: W,
    /// invariant: always remains Some(buf) except
    /// - while IO is ongoing => goes back to Some() once the IO completed successfully
    /// - after an IO error => stays `None` forever
    ///
    /// In these exceptional cases, it's `None`.
-    mutable: Option<B>,
-    /// A handle to the background flush task for writting data to disk.
-    flush_handle: FlushHandle<B::IoBuf, W>,
-    /// The number of bytes submitted to the background task.
-    bytes_submitted: u64,
+    buf: Option<B>,
 }

 impl<B, Buf, W> BufferedWriter<B, W>
 where
-    B: Buffer<IoBuf = Buf> + Send + 'static,
-    Buf: IoBufAligned + Send + Sync + CheapCloneForRead,
-    W: OwnedAsyncWriter + Send + Sync + 'static + std::fmt::Debug,
+    B: Buffer<IoBuf = Buf> + Send,
+    Buf: IoBuf + Send,
+    W: OwnedAsyncWriter,
 {
-    /// Creates a new buffered writer.
-    ///
-    /// The `buf_new` function provides a way to initialize the owned buffers used by this writer.
-    pub fn new(
-        writer: Arc<W>,
-        buf_new: impl Fn() -> B,
-        gate_guard: utils::sync::gate::GateGuard,
-        ctx: &RequestContext,
-    ) -> Self {
+    pub fn new(writer: W, buf: B) -> Self {
        Self {
-            writer: writer.clone(),
-            mutable: Some(buf_new()),
-            flush_handle: FlushHandle::spawn_new(
-                writer,
-                buf_new(),
-                gate_guard,
-                ctx.attached_child(),
-            ),
-            bytes_submitted: 0,
+            writer,
+            buf: Some(buf),
        }
    }

@@ -90,71 +57,87 @@ where
        &self.writer
    }

-    /// Returns the number of bytes submitted to the background flush task.
-    pub fn bytes_submitted(&self) -> u64 {
-        self.bytes_submitted
-    }
-
    /// Panics if used after any of the write paths returned an error
-    pub fn inspect_mutable(&self) -> &B {
-        self.mutable()
-    }
-
-    /// Gets a reference to the maybe flushed read-only buffer.
-    /// Returns `None` if the writer has not submitted any flush request.
-    pub fn inspect_maybe_flushed(&self) -> Option<&FullSlice<Buf>> {
-        self.flush_handle.maybe_flushed.as_ref()
+    pub fn inspect_buffer(&self) -> &B {
+        self.buf()
    }

    #[cfg_attr(target_os = "macos", allow(dead_code))]
-    pub async fn flush_and_into_inner(
-        mut self,
-        ctx: &RequestContext,
-    ) -> std::io::Result<(u64, Arc<W>)> {
+    pub async fn flush_and_into_inner(mut self, ctx: &RequestContext) -> std::io::Result<W> {
        self.flush(ctx).await?;

-        let Self {
-            mutable: buf,
-            writer,
-            mut flush_handle,
-            bytes_submitted: bytes_amount,
-        } = self;
-        flush_handle.shutdown().await?;
+        let Self { buf, writer } = self;
        assert!(buf.is_some());
-        Ok((bytes_amount, writer))
+        Ok(writer)
    }

-    /// Gets a reference to the mutable in-memory buffer.
    #[inline(always)]
-    fn mutable(&self) -> &B {
-        self.mutable
+    fn buf(&self) -> &B {
+        self.buf
            .as_ref()
            .expect("must not use after we returned an error")
    }

+    /// Guarantees that if Ok() is returned, all bytes in `chunk` have been accepted.
    #[cfg_attr(target_os = "macos", allow(dead_code))]
-    pub async fn write_buffered_borrowed(
+    pub async fn write_buffered<S: IoBuf + Send>(
        &mut self,
-        chunk: &[u8],
+        chunk: FullSlice<S>,
        ctx: &RequestContext,
-    ) -> std::io::Result<usize> {
-        let (len, control) = self.write_buffered_borrowed_controlled(chunk, ctx).await?;
-        if let Some(control) = control {
-            control.release().await;
+    ) -> std::io::Result<(usize, FullSlice<S>)> {
+        let chunk = chunk.into_raw_slice();
+
+        let chunk_len = chunk.len();
+        // avoid memcpy for the middle of the chunk
+        if chunk.len() >= self.buf().cap() {
+            self.flush(ctx).await?;
+            // do a big write, bypassing `buf`
+            assert_eq!(
+                self.buf
+                    .as_ref()
+                    .expect("must not use after an error")
+                    .pending(),
+                0
+            );
+            let (nwritten, chunk) = self
+                .writer
+                .write_all(FullSlice::must_new(chunk), ctx)
+                .await?;
+            assert_eq!(nwritten, chunk_len);
+            return Ok((nwritten, chunk));
        }
-        Ok(len)
+        // in-memory copy the < BUFFER_SIZED tail of the chunk
+        assert!(chunk.len() < self.buf().cap());
+        let mut slice = &chunk[..];
+        while !slice.is_empty() {
+            let buf = self.buf.as_mut().expect("must not use after an error");
+            let need = buf.cap() - buf.pending();
+            let have = slice.len();
+            let n = std::cmp::min(need, have);
+            buf.extend_from_slice(&slice[..n]);
+            slice = &slice[n..];
+            if buf.pending() >= buf.cap() {
+                assert_eq!(buf.pending(), buf.cap());
+                self.flush(ctx).await?;
+            }
+        }
+        assert!(slice.is_empty(), "by now we should have drained the chunk");
+        Ok((chunk_len, FullSlice::must_new(chunk)))
    }

-    /// In addition to bytes submitted in this write, also returns a handle that can control the flush behavior.
-    pub(crate) async fn write_buffered_borrowed_controlled(
+    /// Strictly less performant variant of [`Self::write_buffered`] that allows writing borrowed data.
+    ///
+    /// It is less performant because we always have to copy the borrowed data into the internal buffer
+    /// before we can do the IO. The [`Self::write_buffered`] can avoid this, which is more performant
+    /// for large writes.
+    pub async fn write_buffered_borrowed(
        &mut self,
        mut chunk: &[u8],
        ctx: &RequestContext,
-    ) -> std::io::Result<(usize, Option<FlushControl>)> {
+    ) -> std::io::Result<usize> {
        let chunk_len = chunk.len();
-        let mut control: Option<FlushControl> = None;
        while !chunk.is_empty() {
-            let buf = self.mutable.as_mut().expect("must not use after an error");
+            let buf = self.buf.as_mut().expect("must not use after an error");
            let need = buf.cap() - buf.pending();
            let have = chunk.len();
            let n = std::cmp::min(need, have);
@@ -162,27 +145,26 @@ where
            chunk = &chunk[n..];
            if buf.pending() >= buf.cap() {
                assert_eq!(buf.pending(), buf.cap());
-                if let Some(control) = control.take() {
-                    control.release().await;
-                }
-                control = self.flush(ctx).await?;
+                self.flush(ctx).await?;
            }
        }
-        Ok((chunk_len, control))
+        Ok(chunk_len)
    }

-    #[must_use = "caller must explcitly check the flush control"]
-    async fn flush(&mut self, _ctx: &RequestContext) -> std::io::Result<Option<FlushControl>> {
-        let buf = self.mutable.take().expect("must not use after an error");
+    async fn flush(&mut self, ctx: &RequestContext) -> std::io::Result<()> {
+        let buf = self.buf.take().expect("must not use after an error");
        let buf_len = buf.pending();
        if buf_len == 0 {
-            self.mutable = Some(buf);
-            return Ok(None);
+            self.buf = Some(buf);
+            return Ok(());
        }
-        let (recycled, flush_control) = self.flush_handle.flush(buf, self.bytes_submitted).await?;
-        self.bytes_submitted += u64::try_from(buf_len).unwrap();
-        self.mutable = Some(recycled);
-        Ok(Some(flush_control))
+        let slice = buf.flush();
+        let (nwritten, slice) = self.writer.write_all(slice, ctx).await?;
+        assert_eq!(nwritten, buf_len);
+        self.buf = Some(Buffer::reuse_after_flush(
+            slice.into_raw_slice().into_inner(),
+        ));
+        Ok(())
    }
 }

@@ -210,77 +192,64 @@ pub trait Buffer {
    fn reuse_after_flush(iobuf: Self::IoBuf) -> Self;
 }

-impl Buffer for IoBufferMut {
-    type IoBuf = IoBuffer;
+impl Buffer for BytesMut {
+    type IoBuf = BytesMut;

+    #[inline(always)]
    fn cap(&self) -> usize {
        self.capacity()
    }

    fn extend_from_slice(&mut self, other: &[u8]) {
-        if self.len() + other.len() > self.cap() {
-            panic!("Buffer capacity exceeded");
-        }
-
-        IoBufferMut::extend_from_slice(self, other);
+        BytesMut::extend_from_slice(self, other)
    }

+    #[inline(always)]
    fn pending(&self) -> usize {
        self.len()
    }

-    fn flush(self) -> FullSlice<Self::IoBuf> {
-        self.freeze().slice_len()
+    fn flush(self) -> FullSlice<BytesMut> {
+        self.slice_len()
    }

-    /// Caller should make sure that `iobuf` only have one strong reference before invoking this method.
-    fn reuse_after_flush(iobuf: Self::IoBuf) -> Self {
-        let mut recycled = iobuf
-            .into_mut()
-            .expect("buffer should only have one strong reference");
-        recycled.clear();
-        recycled
+    fn reuse_after_flush(mut iobuf: BytesMut) -> Self {
+        iobuf.clear();
+        iobuf
+    }
+}
+
+impl OwnedAsyncWriter for Vec<u8> {
+    async fn write_all<Buf: IoBuf + Send>(
+        &mut self,
+        buf: FullSlice<Buf>,
+        _: &RequestContext,
+    ) -> std::io::Result<(usize, FullSlice<Buf>)> {
+        self.extend_from_slice(&buf[..]);
+        Ok((buf.len(), buf))
    }
 }

 #[cfg(test)]
 mod tests {
-    use std::sync::Mutex;
+    use bytes::BytesMut;

    use super::*;
    use crate::context::{DownloadBehavior, RequestContext};
    use crate::task_mgr::TaskKind;

-    #[derive(Default, Debug)]
+    #[derive(Default)]
    struct RecorderWriter {
-        /// record bytes and write offsets.
-        writes: Mutex<Vec<(Vec<u8>, u64)>>,
+        writes: Vec<Vec<u8>>,
    }
-
-    impl RecorderWriter {
-        /// Gets recorded bytes and write offsets.
-        fn get_writes(&self) -> Vec<Vec<u8>> {
-            self.writes
-                .lock()
-                .unwrap()
-                .iter()
-                .map(|(buf, _)| buf.clone())
-                .collect()
-        }
-    }
-
    impl OwnedAsyncWriter for RecorderWriter {
-        async fn write_all_at<Buf: IoBufAligned + Send>(
-            &self,
+        async fn write_all<Buf: IoBuf + Send>(
+            &mut self,
            buf: FullSlice<Buf>,
-            offset: u64,
            _: &RequestContext,
-        ) -> std::io::Result<FullSlice<Buf>> {
-            self.writes
-                .lock()
-                .unwrap()
-                .push((Vec::from(&buf[..]), offset));
-            Ok(buf)
+        ) -> std::io::Result<(usize, FullSlice<Buf>)> {
+            self.writes.push(Vec::from(&buf[..]));
+            Ok((buf.len(), buf))
        }
    }

@@ -288,21 +257,71 @@ mod tests {
        RequestContext::new(TaskKind::UnitTest, DownloadBehavior::Error)
    }

+    macro_rules! write {
+        ($writer:ident, $data:literal) => {{
+            $writer
+                .write_buffered(::bytes::Bytes::from_static($data).slice_len(), &test_ctx())
+                .await?;
+        }};
+    }
+
    #[tokio::test]
-    async fn test_write_all_borrowed_always_goes_through_buffer() -> anyhow::Result<()> {
+    async fn test_buffered_writes_only() -> std::io::Result<()> {
+        let recorder = RecorderWriter::default();
+        let mut writer = BufferedWriter::new(recorder, BytesMut::with_capacity(2));
+        write!(writer, b"a");
+        write!(writer, b"b");
+        write!(writer, b"c");
+        write!(writer, b"d");
+        write!(writer, b"e");
+        let recorder = writer.flush_and_into_inner(&test_ctx()).await?;
+        assert_eq!(
+            recorder.writes,
+            vec![Vec::from(b"ab"), Vec::from(b"cd"), Vec::from(b"e")]
+        );
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_passthrough_writes_only() -> std::io::Result<()> {
+        let recorder = RecorderWriter::default();
+        let mut writer = BufferedWriter::new(recorder, BytesMut::with_capacity(2));
+        write!(writer, b"abc");
+        write!(writer, b"de");
+        write!(writer, b"");
+        write!(writer, b"fghijk");
+        let recorder = writer.flush_and_into_inner(&test_ctx()).await?;
+        assert_eq!(
+            recorder.writes,
+            vec![Vec::from(b"abc"), Vec::from(b"de"), Vec::from(b"fghijk")]
+        );
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_passthrough_write_with_nonempty_buffer() -> std::io::Result<()> {
+        let recorder = RecorderWriter::default();
+        let mut writer = BufferedWriter::new(recorder, BytesMut::with_capacity(2));
+        write!(writer, b"a");
+        write!(writer, b"bc");
+        write!(writer, b"d");
+        write!(writer, b"e");
+        let recorder = writer.flush_and_into_inner(&test_ctx()).await?;
+        assert_eq!(
+            recorder.writes,
+            vec![Vec::from(b"a"), Vec::from(b"bc"), Vec::from(b"de")]
+        );
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_write_all_borrowed_always_goes_through_buffer() -> std::io::Result<()> {
        let ctx = test_ctx();
        let ctx = &ctx;
-        let recorder = Arc::new(RecorderWriter::default());
-        let gate = utils::sync::gate::Gate::default();
-        let mut writer = BufferedWriter::<_, RecorderWriter>::new(
-            recorder,
-            || IoBufferMut::with_capacity(2),
-            gate.enter()?,
-            ctx,
-        );
+        let recorder = RecorderWriter::default();
+        let mut writer = BufferedWriter::new(recorder, BytesMut::with_capacity(2));

        writer.write_buffered_borrowed(b"abc", ctx).await?;
-        writer.write_buffered_borrowed(b"", ctx).await?;
        writer.write_buffered_borrowed(b"d", ctx).await?;
        writer.write_buffered_borrowed(b"e", ctx).await?;
        writer.write_buffered_borrowed(b"fg", ctx).await?;
@@ -310,9 +329,9 @@ mod tests {
        writer.write_buffered_borrowed(b"j", ctx).await?;
        writer.write_buffered_borrowed(b"klmno", ctx).await?;

-        let (_, recorder) = writer.flush_and_into_inner(ctx).await?;
+        let recorder = writer.flush_and_into_inner(ctx).await?;
        assert_eq!(
-            recorder.get_writes(),
+            recorder.writes,
            {
                let expect: &[&[u8]] = &[b"ab", b"cd", b"ef", b"gh", b"ij", b"kl", b"mn", b"o"];
                expect
--- a/pageserver/src/virtual_file/owned_buffers_io/write/flush.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/write/flush.rs
@@ -1,314 +0,0 @@
-use std::sync::Arc;
-
-use utils::sync::duplex;
-
-use crate::{
-    context::RequestContext,
-    virtual_file::owned_buffers_io::{io_buf_aligned::IoBufAligned, io_buf_ext::FullSlice},
-};
-
-use super::{Buffer, CheapCloneForRead, OwnedAsyncWriter};
-
-/// A handle to the flush task.
-pub struct FlushHandle<Buf, W> {
-    inner: Option<FlushHandleInner<Buf, W>>,
-    /// Immutable buffer for serving tail reads.
-    /// `None` if no flush request has been submitted.
-    pub(super) maybe_flushed: Option<FullSlice<Buf>>,
-}
-
-pub struct FlushHandleInner<Buf, W> {
-    /// A bi-directional channel that sends (buffer, offset) for writes,
-    /// and receives recyled buffer.
-    channel: duplex::mpsc::Duplex<FlushRequest<Buf>, FullSlice<Buf>>,
-    /// Join handle for the background flush task.
-    join_handle: tokio::task::JoinHandle<std::io::Result<Arc<W>>>,
-}
-
-struct FlushRequest<Buf> {
-    slice: FullSlice<Buf>,
-    offset: u64,
-    #[cfg(test)]
-    ready_to_flush_rx: tokio::sync::oneshot::Receiver<()>,
-    #[cfg(test)]
-    done_flush_tx: tokio::sync::oneshot::Sender<()>,
-}
-
-/// Constructs a request and a control object for a new flush operation.
-#[cfg(not(test))]
-fn new_flush_op<Buf>(slice: FullSlice<Buf>, offset: u64) -> (FlushRequest<Buf>, FlushControl) {
-    let request = FlushRequest { slice, offset };
-    let control = FlushControl::untracked();
-
-    (request, control)
-}
-
-/// Constructs a request and a control object for a new flush operation.
-#[cfg(test)]
-fn new_flush_op<Buf>(slice: FullSlice<Buf>, offset: u64) -> (FlushRequest<Buf>, FlushControl) {
-    let (ready_to_flush_tx, ready_to_flush_rx) = tokio::sync::oneshot::channel();
-    let (done_flush_tx, done_flush_rx) = tokio::sync::oneshot::channel();
-    let control = FlushControl::not_started(ready_to_flush_tx, done_flush_rx);
-
-    let request = FlushRequest {
-        slice,
-        offset,
-        ready_to_flush_rx,
-        done_flush_tx,
-    };
-    (request, control)
-}
-
-/// A handle to a `FlushRequest` that allows unit tests precise control over flush behavior.
-#[cfg(test)]
-pub(crate) struct FlushControl {
-    not_started: FlushNotStarted,
-}
-
-#[cfg(not(test))]
-pub(crate) struct FlushControl;
-
-impl FlushControl {
-    #[cfg(test)]
-    fn not_started(
-        ready_to_flush_tx: tokio::sync::oneshot::Sender<()>,
-        done_flush_rx: tokio::sync::oneshot::Receiver<()>,
-    ) -> Self {
-        FlushControl {
-            not_started: FlushNotStarted {
-                ready_to_flush_tx,
-                done_flush_rx,
-            },
-        }
-    }
-
-    #[cfg(not(test))]
-    fn untracked() -> Self {
-        FlushControl
-    }
-
-    /// In tests, turn flush control into a not started state.
-    #[cfg(test)]
-    pub(crate) fn into_not_started(self) -> FlushNotStarted {
-        self.not_started
-    }
-
-    /// Release control to the submitted buffer.
-    ///
-    /// In `cfg(test)` environment, the buffer is guranteed to be flushed to disk after [`FlushControl::release`] is finishes execution.
-    pub async fn release(self) {
-        #[cfg(test)]
-        {
-            self.not_started
-                .ready_to_flush()
-                .wait_until_flush_is_done()
-                .await;
-        }
-    }
-}
-
-impl<Buf, W> FlushHandle<Buf, W>
-where
-    Buf: IoBufAligned + Send + Sync + CheapCloneForRead,
-    W: OwnedAsyncWriter + Send + Sync + 'static + std::fmt::Debug,
-{
-    /// Spawns a new background flush task and obtains a handle.
-    ///
-    /// Note: The background task so we do not need to explicitly maintain a queue of buffers.
-    pub fn spawn_new<B>(
-        file: Arc<W>,
-        buf: B,
-        gate_guard: utils::sync::gate::GateGuard,
-        ctx: RequestContext,
-    ) -> Self
-    where
-        B: Buffer<IoBuf = Buf> + Send + 'static,
-    {
-        // It is fine to buffer up to only 1 message. We only 1 message in-flight at a time.
-        let (front, back) = duplex::mpsc::channel(1);
-
-        let join_handle = tokio::spawn(async move {
-            FlushBackgroundTask::new(back, file, gate_guard, ctx)
-                .run(buf.flush())
-                .await
-        });
-
-        FlushHandle {
-            inner: Some(FlushHandleInner {
-                channel: front,
-                join_handle,
-            }),
-            maybe_flushed: None,
-        }
-    }
-
-    /// Submits a buffer to be flushed in the background task.
-    /// Returns a buffer that completed flushing for re-use, length reset to 0, capacity unchanged.
-    /// If `save_buf_for_read` is true, then we save the buffer in `Self::maybe_flushed`, otherwise
-    /// clear `maybe_flushed`.
-    pub async fn flush<B>(&mut self, buf: B, offset: u64) -> std::io::Result<(B, FlushControl)>
-    where
-        B: Buffer<IoBuf = Buf> + Send + 'static,
-    {
-        let slice = buf.flush();
-
-        // Saves a buffer for read while flushing. This also removes reference to the old buffer.
-        self.maybe_flushed = Some(slice.cheap_clone());
-
-        let (request, flush_control) = new_flush_op(slice, offset);
-
-        // Submits the buffer to the background task.
-        let submit = self.inner_mut().channel.send(request).await;
-        if submit.is_err() {
-            return self.handle_error().await;
-        }
-
-        // Wait for an available buffer from the background flush task.
-        // This is the BACKPRESSURE mechanism: if the flush task can't keep up,
-        // then the write path will eventually wait for it here.
-        let Some(recycled) = self.inner_mut().channel.recv().await else {
-            return self.handle_error().await;
-        };
-
-        // The only other place that could hold a reference to the recycled buffer
-        // is in `Self::maybe_flushed`, but we have already replace it with the new buffer.
-        let recycled = Buffer::reuse_after_flush(recycled.into_raw_slice().into_inner());
-        Ok((recycled, flush_control))
-    }
-
-    async fn handle_error<T>(&mut self) -> std::io::Result<T> {
-        Err(self
-            .shutdown()
-            .await
-            .expect_err("flush task only disconnects duplex if it exits with an error"))
-    }
-
-    /// Cleans up the channel, join the flush task.
-    pub async fn shutdown(&mut self) -> std::io::Result<Arc<W>> {
-        let handle = self
-            .inner
-            .take()
-            .expect("must not use after we returned an error");
-        drop(handle.channel.tx);
-        handle.join_handle.await.unwrap()
-    }
-
-    /// Gets a mutable reference to the inner handle. Panics if [`Self::inner`] is `None`.
-    /// This only happens if the handle is used after an error.
-    fn inner_mut(&mut self) -> &mut FlushHandleInner<Buf, W> {
-        self.inner
-            .as_mut()
-            .expect("must not use after we returned an error")
-    }
-}
-
-/// A background task for flushing data to disk.
-pub struct FlushBackgroundTask<Buf, W> {
-    /// A bi-directional channel that receives (buffer, offset) for writes,
-    /// and send back recycled buffer.
-    channel: duplex::mpsc::Duplex<FullSlice<Buf>, FlushRequest<Buf>>,
-    /// A writter for persisting data to disk.
-    writer: Arc<W>,
-    ctx: RequestContext,
-    /// Prevent timeline from shuting down until the flush background task finishes flushing all remaining buffers to disk.
-    _gate_guard: utils::sync::gate::GateGuard,
-}
-
-impl<Buf, W> FlushBackgroundTask<Buf, W>
-where
-    Buf: IoBufAligned + Send + Sync,
-    W: OwnedAsyncWriter + Sync + 'static,
-{
-    /// Creates a new background flush task.
-    fn new(
-        channel: duplex::mpsc::Duplex<FullSlice<Buf>, FlushRequest<Buf>>,
-        file: Arc<W>,
-        gate_guard: utils::sync::gate::GateGuard,
-        ctx: RequestContext,
-    ) -> Self {
-        FlushBackgroundTask {
-            channel,
-            writer: file,
-            _gate_guard: gate_guard,
-            ctx,
-        }
-    }
-
-    /// Runs the background flush task.
-    /// The passed in slice is immediately sent back to the flush handle through the duplex channel.
-    async fn run(mut self, slice: FullSlice<Buf>) -> std::io::Result<Arc<W>> {
-        // Sends the extra buffer back to the handle.
-        self.channel.send(slice).await.map_err(|_| {
-            std::io::Error::new(std::io::ErrorKind::BrokenPipe, "flush handle closed early")
-        })?;
-
-        //  Exit condition: channel is closed and there is no remaining buffer to be flushed
-        while let Some(request) = self.channel.recv().await {
-            #[cfg(test)]
-            {
-                // In test, wait for control to signal that we are ready to flush.
-                if request.ready_to_flush_rx.await.is_err() {
-                    tracing::debug!("control dropped");
-                }
-            }
-
-            // Write slice to disk at `offset`.
-            let slice = self
-                .writer
-                .write_all_at(request.slice, request.offset, &self.ctx)
-                .await?;
-
-            #[cfg(test)]
-            {
-                // In test, tell control we are done flushing buffer.
-                if request.done_flush_tx.send(()).is_err() {
-                    tracing::debug!("control dropped");
-                }
-            }
-
-            // Sends the buffer back to the handle for reuse. The handle is in charged of cleaning the buffer.
-            if self.channel.send(slice).await.is_err() {
-                // Although channel is closed. Still need to finish flushing the remaining buffers.
-                continue;
-            }
-        }
-
-        Ok(self.writer)
-    }
-}
-
-#[cfg(test)]
-pub(crate) struct FlushNotStarted {
-    ready_to_flush_tx: tokio::sync::oneshot::Sender<()>,
-    done_flush_rx: tokio::sync::oneshot::Receiver<()>,
-}
-
-#[cfg(test)]
-pub(crate) struct FlushInProgress {
-    done_flush_rx: tokio::sync::oneshot::Receiver<()>,
-}
-
-#[cfg(test)]
-pub(crate) struct FlushDone;
-
-#[cfg(test)]
-impl FlushNotStarted {
-    /// Signals the background task the buffer is ready to flush to disk.
-    pub fn ready_to_flush(self) -> FlushInProgress {
-        self.ready_to_flush_tx
-            .send(())
-            .map(|_| FlushInProgress {
-                done_flush_rx: self.done_flush_rx,
-            })
-            .unwrap()
-    }
-}
-
-#[cfg(test)]
-impl FlushInProgress {
-    /// Waits until background flush is done.
-    pub async fn wait_until_flush_is_done(self) -> FlushDone {
-        self.done_flush_rx.await.unwrap();
-        FlushDone
-    }
-}
--- a/pageserver/src/walingest.rs
+++ b/pageserver/src/walingest.rs
@@ -1392,10 +1392,6 @@ impl WalIngest {
        img: Bytes,
        ctx: &RequestContext,
    ) -> Result<()> {
-        if !self.shard.is_shard_zero() {
-            return Ok(());
-        }
-
        self.handle_slru_extend(modification, kind, segno, blknum, ctx)
            .await?;
        modification.put_slru_page_image(kind, segno, blknum, img)?;
--- a/pgxn/neon/neon.c
+++ b/pgxn/neon/neon.c
@@ -15,9 +15,6 @@
 #include "access/subtrans.h"
 #include "access/twophase.h"
 #include "access/xlog.h"
-#if PG_MAJORVERSION_NUM >= 15
-#include "access/xlogrecovery.h"
-#endif
 #include "replication/logical.h"
 #include "replication/slot.h"
 #include "replication/walsender.h"
@@ -435,16 +432,6 @@ _PG_init(void)
 	restore_running_xacts_callback = RestoreRunningXactsFromClog;


-	DefineCustomBoolVariable(
-							"neon.allow_replica_misconfig",
-							"Allow replica startup when some critical GUCs have smaller value than on primary node",
-							NULL,
-							&allowReplicaMisconfig,
-							true,
-							PGC_POSTMASTER,
-							0,
-							NULL, NULL, NULL);
-
 	DefineCustomEnumVariable(
 							"neon.running_xacts_overflow_policy",
 							"Action performed on snapshot overflow when restoring runnings xacts from CLOG",
--- a/pgxn/neon/pagestore_smgr.c
+++ b/pgxn/neon/pagestore_smgr.c
@@ -439,8 +439,6 @@ readahead_buffer_resize(int newsize, void *extra)
 	newPState->ring_unused = newsize;
 	newPState->ring_receive = newsize;
 	newPState->ring_flush = newsize;
-	newPState->max_shard_no = MyPState->max_shard_no;
-	memcpy(newPState->shard_bitmap, MyPState->shard_bitmap, sizeof(MyPState->shard_bitmap));

 	/*
 	 * Copy over the prefetches.
@@ -497,11 +495,7 @@ readahead_buffer_resize(int newsize, void *extra)

 	for (; end >= MyPState->ring_last && end != UINT64_MAX; end -= 1)
 	{
-		PrefetchRequest *slot = GetPrfSlot(end);
-		if (slot->status == PRFS_RECEIVED)
-		{
-			pfree(slot->response);
-		}
+		prefetch_set_unused(end);
 	}

 	prfh_destroy(MyPState->prf_hash);
@@ -950,9 +944,6 @@ Retry:
 		Assert(entry == NULL);
 		Assert(slot == NULL);

-		/* There should be no buffer overflow */
-		Assert(MyPState->ring_last + readahead_buffer_size >= MyPState->ring_unused);
-
 		/*
 		 * If the prefetch queue is full, we need to make room by clearing the
 		 * oldest slot. If the oldest slot holds a buffer that was already
@@ -967,7 +958,7 @@ Retry:
 		 * a prefetch request kind of goes against the principles of
 		 * prefetching)
 		 */
-		if (MyPState->ring_last + readahead_buffer_size == MyPState->ring_unused)
+		if (MyPState->ring_last + readahead_buffer_size - 1 == MyPState->ring_unused)
 		{
 			uint64		cleanup_index = MyPState->ring_last;

--- a/proxy/Cargo.toml
+++ b/proxy/Cargo.toml
@@ -6,7 +6,7 @@ license.workspace = true

 [features]
 default = []
-testing = ["dep:tokio-postgres"]
+testing = []

 [dependencies]
 ahash.workspace = true
@@ -55,7 +55,6 @@ parquet.workspace = true
 parquet_derive.workspace = true
 pin-project-lite.workspace = true
 postgres_backend.workspace = true
-postgres-client = { package = "tokio-postgres2", path = "../libs/proxy/tokio-postgres2" }
 postgres-protocol = { package = "postgres-protocol2", path = "../libs/proxy/postgres-protocol2" }
 pq_proto.workspace = true
 prometheus.workspace = true
@@ -82,7 +81,7 @@ subtle.workspace = true
 thiserror.workspace = true
 tikv-jemallocator.workspace = true
 tikv-jemalloc-ctl = { workspace = true, features = ["use_std"] }
-tokio-postgres = { workspace = true, optional = true }
+tokio-postgres = { package = "tokio-postgres2", path = "../libs/proxy/tokio-postgres2" }
 tokio-rustls.workspace = true
 tokio-util.workspace = true
 tokio = { workspace = true, features = ["signal"] }
@@ -113,11 +112,9 @@ workspace_hack.workspace = true
 [dev-dependencies]
 camino-tempfile.workspace = true
 fallible-iterator.workspace = true
-flate2.workspace = true
 tokio-tungstenite.workspace = true
 pbkdf2 = { workspace = true, features = ["simple", "std"] }
 rcgen.workspace = true
 rstest.workspace = true
 walkdir.workspace = true
 rand_distr = "0.4"
-tokio-postgres.workspace = true
--- a/proxy/src/auth/backend/classic.rs
+++ b/proxy/src/auth/backend/classic.rs
@@ -66,7 +66,7 @@ pub(super) async fn authenticate(

    Ok(ComputeCredentials {
        info: creds,
-        keys: ComputeCredentialKeys::AuthKeys(postgres_client::config::AuthKeys::ScramSha256(
+        keys: ComputeCredentialKeys::AuthKeys(tokio_postgres::config::AuthKeys::ScramSha256(
            scram_keys,
        )),
    })
--- a/proxy/src/auth/backend/console_redirect.rs
+++ b/proxy/src/auth/backend/console_redirect.rs
@@ -1,8 +1,8 @@
 use async_trait::async_trait;
-use postgres_client::config::SslMode;
 use pq_proto::BeMessage as Be;
 use thiserror::Error;
 use tokio::io::{AsyncRead, AsyncWrite};
+use tokio_postgres::config::SslMode;
 use tracing::{info, info_span};

 use super::ComputeCredentialKeys;
@@ -49,19 +49,13 @@ impl ReportableError for ConsoleRedirectError {
    }
 }

-fn hello_message(
-    redirect_uri: &reqwest::Url,
-    session_id: &str,
-    duration: std::time::Duration,
-) -> String {
-    let formatted_duration = humantime::format_duration(duration).to_string();
+fn hello_message(redirect_uri: &reqwest::Url, session_id: &str) -> String {
    format!(
        concat![
            "Welcome to Neon!\n",
-            "Authenticate by visiting (will expire in {duration}):\n",
+            "Authenticate by visiting:\n",
            "    {redirect_uri}{session_id}\n\n",
        ],
-        duration = formatted_duration,
        redirect_uri = redirect_uri,
        session_id = session_id,
    )
@@ -124,11 +118,7 @@ async fn authenticate(
    };

    let span = info_span!("console_redirect", psql_session_id = &psql_session_id);
-    let greeting = hello_message(
-        link_uri,
-        &psql_session_id,
-        auth_config.console_redirect_confirmation_timeout,
-    );
+    let greeting = hello_message(link_uri, &psql_session_id);

    // Give user a URL to spawn a new database.
    info!(parent: &span, "sending the auth URL to the user");
@@ -161,8 +151,12 @@ async fn authenticate(

    // This config should be self-contained, because we won't
    // take username or dbname from client's startup message.
-    let mut config = compute::ConnCfg::new(db_info.host.to_string(), db_info.port);
-    config.dbname(&db_info.dbname).user(&db_info.user);
+    let mut config = compute::ConnCfg::new();
+    config
+        .host(&db_info.host)
+        .port(db_info.port)
+        .dbname(&db_info.dbname)
+        .user(&db_info.user);

    ctx.set_dbname(db_info.dbname.into());
    ctx.set_user(db_info.user.into());
--- a/proxy/src/auth/backend/jwt.rs
+++ b/proxy/src/auth/backend/jwt.rs
@@ -350,13 +350,6 @@ impl JwkCacheEntryLock {
        let header = base64::decode_config(header, base64::URL_SAFE_NO_PAD)?;
        let header = serde_json::from_slice::<JwtHeader<'_>>(&header)?;

-        let payloadb = base64::decode_config(payload, base64::URL_SAFE_NO_PAD)?;
-        let payload = serde_json::from_slice::<JwtPayload<'_>>(&payloadb)?;
-
-        if let Some(iss) = &payload.issuer {
-            ctx.set_jwt_issuer(iss.as_ref().to_owned());
-        }
-
        let sig = base64::decode_config(signature, base64::URL_SAFE_NO_PAD)?;

        let kid = header.key_id.ok_or(JwtError::MissingKeyId)?;
@@ -395,6 +388,9 @@ impl JwkCacheEntryLock {
            key => return Err(JwtError::UnsupportedKeyType(key.into())),
        };

+        let payloadb = base64::decode_config(payload, base64::URL_SAFE_NO_PAD)?;
+        let payload = serde_json::from_slice::<JwtPayload<'_>>(&payloadb)?;
+
        tracing::debug!(?payload, "JWT signature valid with claims");

        if let Some(aud) = expected_audience {
--- a/proxy/src/auth/backend/local.rs
+++ b/proxy/src/auth/backend/local.rs
@@ -29,7 +29,12 @@ impl LocalBackend {
                api: http::Endpoint::new(compute_ctl, http::new_client()),
            },
            node_info: NodeInfo {
-                config: ConnCfg::new(postgres_addr.ip().to_string(), postgres_addr.port()),
+                config: {
+                    let mut cfg = ConnCfg::new();
+                    cfg.host(&postgres_addr.ip().to_string());
+                    cfg.port(postgres_addr.port());
+                    cfg
+                },
                // TODO(conrad): make this better reflect compute info rather than endpoint info.
                aux: MetricsAuxInfo {
                    endpoint_id: EndpointIdTag::get_interner().get_or_intern("local"),
--- a/proxy/src/auth/backend/mod.rs
+++ b/proxy/src/auth/backend/mod.rs
@@ -11,8 +11,8 @@ pub use console_redirect::ConsoleRedirectBackend;
 pub(crate) use console_redirect::ConsoleRedirectError;
 use ipnet::{Ipv4Net, Ipv6Net};
 use local::LocalBackend;
-use postgres_client::config::AuthKeys;
 use tokio::io::{AsyncRead, AsyncWrite};
+use tokio_postgres::config::AuthKeys;
 use tracing::{debug, info, warn};

 use crate::auth::credentials::check_peer_addr_is_in_list;
@@ -70,10 +70,6 @@ impl std::fmt::Display for Backend<'_, ()> {
    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::ControlPlane(api, ()) => match &**api {
-                ControlPlaneClient::ProxyV1(endpoint) => fmt
-                    .debug_tuple("ControlPlane::ProxyV1")
-                    .field(&endpoint.url())
-                    .finish(),
                ControlPlaneClient::Neon(endpoint) => fmt
                    .debug_tuple("ControlPlane::Neon")
                    .field(&endpoint.url())
--- a/Show More
+++ b/Show More