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Continuously samples event-loop delay via perf_hooks.monitorEventLoopDelay() (C++-backed histogram; cheap). Each window persists mean/p50/p99/max to a new event_loop_lag table and recomputes a coarse load band (normal/elevated/critical) from the window p99. Standalone value: current lag is exposed on /api/status and band changes are logged, so site lag is diagnosable independent of throttling. The band feeds the #142 reconnect throttle (next commit) but ships first as its own subsystem. - event_loop_lag is bounded from day one: indexed on sampled_at + scheduled prune (LAG_TELEMETRY_RETENTION_DAYS, small default) modeled on the play_logs prune. Deliberately NOT another unbounded-growth table. - Band transitions are asymmetric: jump up immediately (tighten fast), release one level at a time after N calm samples below a deadband (release slow, no flap). Pure nextBand() function, unit-tested deterministically. - config: LAG_SAMPLE_INTERVAL_MS, LAG_RESOLUTION_MS, LAG_TELEMETRY_RETENTION_DAYS, LAG_PRUNE_INTERVAL_MS, LAG_ELEVATED_MS, LAG_CRITICAL_MS, LAG_RELEASE_SAMPLES. - tests: band-transition unit tests; integration proves sampling persists, stays bounded under the prune, and surfaces on /api/status. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| .. | ||
| config | ||
| db | ||
| lib | ||
| middleware | ||
| player | ||
| routes | ||
| scripts | ||
| services | ||
| test | ||
| ws | ||
| .gitignore | ||
| config.js | ||
| package-lock.json | ||
| package.json | ||
| server.js | ||
| version.js | ||