[mongo] Add metrics for fsyncLocked-ness, replset votes and vote fraction #2952
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These are useful for validating replset configuration
(e.g. `sum:mongodb.replSet.voteFraction{} by
{mongo_replset,availability-zone}`)
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Hey @olivielpeau, any chance we can get that 5.10 tag on this one? 😸 |
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What does this PR do?
This introduces 3 new metrics:
Motivation
These metrics are part of our monitoring for mongo node health. We alert on nodes being fsyncLocked for an extended period of time (since it usually indicates forgotten maintenance), and on voteFraction-grouped-by-AZ being > 0.5, since that indicates that loss of an AZ would break quorum.