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Improve PostgreSQL replication lag detection (#395)

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In some cases master can show pg_last_xact_replay_timestamp() from past,
which can cause the exporter to show ever-growing value for the lag.

By checking if the instance is in recovery we can avoid reporting some
huge number for master instance.
This commit is contained in:
Jakov Sosic 2020-12-24 16:39:43 +01:00 committed by GitHub
parent bfd0707e37
commit f188bdef53
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2
queries.yaml
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@ -1,5 +1,5 @@
pg_replication:
query: "SELECT EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) as lag"
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"
master: true
metrics:
- lag: