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Add compute_logical_snapshots_bytes metric (#9887)

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This metric exposes the size of all non-temporary logical snapshot
files.

Signed-off-by: Tristan Partin <tristan@neon.tech>
This commit is contained in:
Tristan Partin
2024-12-05 13:04:33 -06:00
committed by GitHub
parent 13e8105740
commit c0ba416967
4 changed files with 34 additions and 0 deletions
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1
compute/etc/neon_collector.jsonnet
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@@ -6,6 +6,7 @@
import 'sql_exporter/compute_backpressure_throttling_seconds.libsonnet',
import 'sql_exporter/compute_current_lsn.libsonnet',
import 'sql_exporter/compute_logical_snapshot_files.libsonnet',
import 'sql_exporter/compute_logical_snapshots_bytes.libsonnet',
import 'sql_exporter/compute_max_connections.libsonnet',
import 'sql_exporter/compute_receive_lsn.libsonnet',
import 'sql_exporter/compute_subscriptions_count.libsonnet',

7
compute/etc/sql_exporter/compute_logical_snapshots_bytes.15.sql Normal file
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@@ -0,0 +1,7 @@
SELECT
(SELECT current_setting('neon.timeline_id')) AS timeline_id,
-- Postgres creates temporary snapshot files of the form %X-%X.snap.%d.tmp.
-- These temporary snapshot files are renamed to the actual snapshot files
-- after they are completely built. We only WAL-log the completely built
-- snapshot files
(SELECT COALESCE(sum(size), 0) FROM pg_ls_logicalsnapdir() WHERE name LIKE '%.snap') AS logical_snapshots_bytes;

17
compute/etc/sql_exporter/compute_logical_snapshots_bytes.libsonnet Normal file
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@@ -0,0 +1,17 @@
local neon = import 'neon.libsonnet';
local pg_ls_logicalsnapdir = importstr 'sql_exporter/compute_logical_snapshots_bytes.15.sql';
local pg_ls_dir = importstr 'sql_exporter/compute_logical_snapshots_bytes.sql';
{
metric_name: 'compute_logical_snapshots_bytes',
type: 'gauge',
help: 'Size of the pg_logical/snapshots directory, not including temporary files',
key_labels: [
'timeline_id',
],
values: [
'logical_snapshots_bytes',
],
query: if neon.PG_MAJORVERSION_NUM < 15 then pg_ls_dir else pg_ls_logicalsnapdir,
}

9
compute/etc/sql_exporter/compute_logical_snapshots_bytes.sql Normal file
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@@ -0,0 +1,9 @@
SELECT
(SELECT setting FROM pg_settings WHERE name = 'neon.timeline_id') AS timeline_id,
-- Postgres creates temporary snapshot files of the form %X-%X.snap.%d.tmp.
-- These temporary snapshot files are renamed to the actual snapshot files
-- after they are completely built. We only WAL-log the completely built
-- snapshot files
(SELECT COALESCE(sum((pg_stat_file('pg_logical/snapshots/' || name, missing_ok => true)).size), 0)
FROM (SELECT * FROM pg_ls_dir('pg_logical/snapshots') WHERE pg_ls_dir LIKE '%.snap') AS name
) AS logical_snapshots_bytes;