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pageserver: add gRPC observability middleware (#12093)

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## Problem

The page service logic asserts that a tracing span is present with
tenant/timeline/shard IDs. An initial gRPC page service implementation
thus requires a tracing span.

Touches https://github.com/neondatabase/neon/issues/11728.

## Summary of changes

Adds an `ObservabilityLayer` middleware that generates a tracing span
and decorates it with IDs from the gRPC metadata.

This is a minimal implementation to address the tracing span assertion.
It will be extended with additional observability in later PRs.
This commit is contained in:
Erik Grinaker
2025-06-02 13:46:50 +02:00
committed by GitHub
parent 5b62749c42
commit 8d7ed2a4ee
5 changed files with 134 additions and 27 deletions
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@@ -4305,6 +4305,7 @@ dependencies = [
"hashlink",
"hex",
"hex-literal",
"http 1.1.0",
"http-utils",
"humantime",
"humantime-serde",
@@ -4367,6 +4368,7 @@ dependencies = [
"toml_edit",
"tonic 0.13.1",
"tonic-reflection",
"tower 0.5.2",
"tracing",
"tracing-utils",
"twox-hash",