compactor-scheduler: report queue metrics per lane - #16489
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Adds a lane label to the backlog gauge and a per-lane last-empty timestamp, so a fleet serving one lane can be sized from its own backlog.
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What this PR does
Adds some per-lane metrics, which will be useful to autoscale per-lane worker fleets.
cortex_compactor_scheduler_incomplete_compaction_jobs_bytesby lane (only for lanes that carry compaction work). This plays well with existing dashboard panels and autoscalers, theysum by (compaction_type)cortex_compactor_scheduler_lane_pending_jobs_last_empty_timestamp_seconds. Adding a label to the existing metric would not carry the same meaning (we'd have no way to know when all lanes where empty at the same time)Which issue(s) this PR fixes or relates to
Fixes N/A
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]. If changelog entry is not needed, please add thechangelog-not-neededlabel to the PR.about-versioning.mdupdated with experimental features.