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compute: metrics for autovacuum (mxid, postgres) (#12294)

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## Problem

Currently we do not have metrics for autovacuum.

## Summary of changes

Added a metric that extracts the top 5 DBs with oldest mxid and frozen
xid. Tables that were vacuumed recently should have younger value (or
younger age).

Related Issue: https://github.com/neondatabase/cloud/issues/27296
This commit is contained in:
Suhas Thalanki
2025-07-01 11:33:23 -04:00
committed by GitHub
parent 4932963bac
commit 0934ce9bce
5 changed files with 36 additions and 0 deletions
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2
compute/etc/neon_collector.jsonnet
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@@ -8,6 +8,8 @@
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_pg_oldest_frozen_xid_age.libsonnet',
import 'sql_exporter/compute_pg_oldest_mxid_age.libsonnet',
import 'sql_exporter/compute_receive_lsn.libsonnet',
import 'sql_exporter/compute_subscriptions_count.libsonnet',
import 'sql_exporter/connection_counts.libsonnet',

13
compute/etc/sql_exporter/compute_pg_oldest_frozen_xid_age.libsonnet Normal file
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@@ -0,0 +1,13 @@
{
metric_name: 'compute_pg_oldest_frozen_xid_age',
type: 'gauge',
help: 'Age of oldest XIDs that have not been frozen by VACUUM. An indicator of how long it has been since VACUUM last ran.',
key_labels: [
'database_name',
],
value_label: 'metric',
values: [
'frozen_xid_age',
],
query: importstr 'sql_exporter/compute_pg_oldest_frozen_xid_age.sql',
}

4
compute/etc/sql_exporter/compute_pg_oldest_frozen_xid_age.sql Normal file
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@@ -0,0 +1,4 @@
SELECT datname database_name,
age(datfrozenxid) frozen_xid_age
FROM pg_database
ORDER BY frozen_xid_age DESC LIMIT 10;

13
compute/etc/sql_exporter/compute_pg_oldest_mxid_age.libsonnet Normal file
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@@ -0,0 +1,13 @@
{
metric_name: 'compute_pg_oldest_mxid_age',
type: 'gauge',
help: 'Age of oldest MXIDs that have not been replaced by VACUUM. An indicator of how long it has been since VACUUM last ran.',
key_labels: [
'database_name',
],
value_label: 'metric',
values: [
'min_mxid_age',
],
query: importstr 'sql_exporter/compute_pg_oldest_mxid_age.sql',
}

4
compute/etc/sql_exporter/compute_pg_oldest_mxid_age.sql Normal file
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@@ -0,0 +1,4 @@
SELECT datname database_name,
mxid_age(datminmxid) min_mxid_age
FROM pg_database
ORDER BY min_mxid_age DESC LIMIT 10;