feat: stale process webhook alert#74
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Add StaleProcessAlert service and alert_stale_process_threshold config. Fires a webhook (event: stale_process_detected) when the number of stale workers meets or exceeds the configured count. A process is stale when last_heartbeat_at has not been updated within SolidQueue.process_alive_threshold. Uses the same alert_webhook_url and alert_webhook_cooldown settings as other alert types. Triggered on every dashboard page load, subject to cooldown. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
… alert Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
alert_stale_process_thresholdconfig option (integer) — fires a webhook when the number of stale workers meets or exceeds this countlast_heartbeat_athas not been updated withinSolidQueue.process_alive_threshold(default 5 minutes) — the same threshold used by the Processes pageStaleProcessAlertservice following the same pattern as the other alert services: async background thread, cooldown tracking, multi-URL fan-out, graceful error loggingDashboardController#indexalongside the existing failure, queue-depth, and slow-job alertsstale_process_detected; no extra duration config required — reuses SolidQueue's own alive thresholdTest plan
Closes #61
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