feat: Heartbeat shard statistics#7431

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Theis-Mathiassen wants to merge 56 commits intocadence-workflow:masterfrom

AndreasHolt:heartbeat-shard-statistics

Commits on Oct 20, 2025

feat(shard distributor): add shard key helpers and metrics state
AndreasHolt
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feat(shard distributor): persist shard metrics in etcd store
AndreasHolt
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fix(shard distributor): update LastMoveTime in the case where a shard is being reassigned in AssignShard
AndreasHolt
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test(shard distributor): add tests for shard metrics
AndreasHolt
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fix(shard distributor): modify comment
AndreasHolt
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fix(shard distributor): add atomic check to prevent metrics race
AndreasHolt
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fix(shard distributor): apply shard metric updates in a second phase to not overload etcd's 128 max ops per txn
AndreasHolt
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feat(shard distributor): move shard metric updates out of AssignShards txn and retry monotonically
AndreasHolt
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fix(shard distributor): keep NamespaceState revisions tied to assignments
AndreasHolt
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Commits on Oct 22, 2025

Commits on Oct 23, 2025

feat(shard distributor): simplify shard metrics updates
AndreasHolt
committed

Commits on Oct 24, 2025

refactor(shard distributor): ShardMetrics renamed to ShardStatistics. And more idiomatic naming of collection vs singular type
AndreasHolt
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Commits on Oct 25, 2025

Commits on Oct 27, 2025

Commits on Oct 29, 2025

Commits on Oct 30, 2025

feat(shard distributor): retain shard stats while shards are within heartbeat TTL
AndreasHolt
committed

Commits on Nov 2, 2025

Commits on Nov 6, 2025

Merge branch 'master' into heartbeat-shard-statistics
Theis-Mathiassen
committed

Commits on Nov 11, 2025

Commits on Nov 13, 2025

Commits on Nov 18, 2025

feat(shard distributor): decouple shard stats write-throttling decision from heartbeat TTL
AndreasHolt
committed

Commits on Nov 19, 2025

Commits on Nov 20, 2025

chore(shard-distributor): did some formatting, and use current load instead of new ewma for determinig if it should persist
Theis-Mathiassen
committed