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Sync-critical job types run at very low concurrency limits (ledgerRequest
and ledgerData allow 3 each), so a node can stall simply because those
jobs are held back behind other work. Nothing exposed that until now:
the existing job metrics are rates and quantiles of jobs that already
moved, or a single queue-wide depth.
- jobq_backlog{metric,job_type}: instantaneous waiting, running and
deferred counts per job type. Deferred is the starvation signal and had
no exposure anywhere; it is set when a type is at its concurrency limit.
- jobq_saturation{metric}: running tasks, worker-thread count and total
waiting, so a slowdown spanning several subsystems can be attributed to
worker-pool exhaustion instead of being diagnosed once per victim.
Both read through two new const accessors on JobQueue that take the
existing mutex once and copy integers, so a single reading is internally
consistent and no per-job cost is added. The job_type label reuses the
same JobTypes name helper the existing job counters use, so the two label
sets join.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>