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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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9
compute/etc/sql_exporter/compute_logical_snapshots_bytes.sql Normal file
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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;