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Fix MongoDB replication headroom query (#342)

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The query was changed to use `mongodb_oplog_stats_start` and
`mongodb_oplog_stats_end` in #291 but these metrics does not represent
the start and end of the oplog. The original head and tail metrics are
calculated from the oplog and are consistent with the output of
`db.getReplicationInfo()`.
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Mikael Lindström 2023-04-03 10:01:25 +02:00 committed by GitHub
parent f9b43cf3bf
commit 2617aa5dab
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_data/rules.yml
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@ -792,7 +792,7 @@ groups:
severity: critical
- name: MongoDB replication headroom
description: MongoDB replication headroom is <= 0
query: 'sum(avg(mongodb_oplog_stats_start - mongodb_oplog_stats_end)) - sum(avg(mongodb_rs_members_optimeDate{member_state="PRIMARY"} - on (set) group_right mongodb_rs_members_optimeDate{member_state="SECONDARY"})) <= 0'
query: 'sum(avg(mongodb_mongod_replset_oplog_head_timestamp - mongodb_mongod_replset_oplog_tail_timestamp)) - sum(avg(mongodb_rs_members_optimeDate{member_state="PRIMARY"} - on (set) group_right mongodb_rs_members_optimeDate{member_state="SECONDARY"})) <= 0'
severity: critical
- name: MongoDB number cursors open
description: Too many cursors opened by MongoDB for clients (> 10k)