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Improve PostgreSQL replication lag detection in low traffic PostgreSQL cluster #534

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Improve PostgreSQL replication lag detection in low traffic PostgreSQL cluster #534

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10 changes: 9 additions & 1 deletion queries.yaml
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Original file line number Diff line number Diff line change
@@ -1,5 +1,13 @@
pg_replication:
query: "SELECT CASE WHEN NOT pg_is_in_recovery() THEN 0 ELSE GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp()))) END AS lag"
query: |
SELECT
CASE WHEN NOT pg_is_in_recovery() THEN
0
WHEN pg_last_wal_receive_lsn () = pg_last_wal_replay_lsn () THEN
0
ELSE
GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())))
END AS lag
master: true
metrics:
- lag:
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