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Add compute_logical_snapshot_files metric #8762

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Aug 21, 2024
Merged

Add compute_logical_snapshot_files metric #8762

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16 changes: 16 additions & 0 deletions vm-image-spec.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -312,6 +312,22 @@ files:
query: |
SELECT checkpoints_timed FROM pg_stat_bgwriter;

- metric_name: compute_logical_snapshot_files
type: guage
help: 'Number of snapshot files in pg_logical/snapshot'
key_labels:
- tenant_id
- timeline_id
values: [num_logical_snapshot_files]
query: |
SELECT
(SELECT setting FROM pg_settings WHERE name = 'neon.tenant_id') AS tenant_id,
(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 COUNT(*) FROM pg_ls_logicalsnapdir() WHERE name LIKE '%.snap') AS num_logical_snapshot_files;

# In all the below metrics, we cast LSNs to floats because Prometheus only supports floats.
# It's probably fine because float64 can store integers from -2^53 to +2^53 exactly.

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