feat(shard-distributor): add shard handover latency metrics #7442
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What changed?
Added metrics to track shard assignment distribution and handover latency in the shard distributor service. This includes:
ShardDistributorShardAssignmentDistributionLatencymetric measuring time from shard assignment to distributionShardDistributorShardHandoverLatencymetric measuring handover time between executorsHandoverTypeenum (GRACEFUL/EMERGENCY) to distinguish handover typesWhy?
To provide visibility into shard distribution performance and identify potential issues with shard handovers, particularly distinguishing between graceful and emergency handovers.
How did you test it?
Added comprehensive unit tests covering metric emission logic and shard statistics tracking.
Potential risks
Additional storage operations during heartbeat processing (mitigated by running metrics emission in background goroutine).
Release notes
Added shard handover latency metrics for monitoring distribution performance.
Documentation Changes
None required.