Rework worker stats: configurable consumers, occupancy tracking - #377
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utilizationcounts only in-task time, so a worker saturated with many short tasks reads well below 100% — the between-task overhead is invisible. This broke our utilization-based autoscaling: workers scaled down under a large backlog.The worker now also measures idle time (blocking waits for work) and reports busy + idle to a configurable
STATS_CONSUMERSlist, replacing the always-on stats thread. The bundledStatsThreadconsumer addstime_idle,time_overhead, andoccupancy = 100 * busy / (busy + idle)— the busy share of attributable time; ~100 when saturated regardless of overhead, 0 when idle.STATS_INTERVALremoved; the periodicstatsline no longer logs by default. Restore withSTATS_CONSUMERS=[StatsThread(log, interval=60)].StatsThread(tiger)→StatsThread(log, interval);worker.StatsThreadis gone, so monkey-patching it silently stops working — subclassstats.StatsConsumerand register viaSTATS_CONSUMERS.Worker.stats_thread→Worker.stats(list of consumers).Commit 1 reworks the measurement; commit 2 redefines
occupancyto exclude overhead.