My uptime monitor generated 932 phantom outages on its own

▤ Summary

This article explains why an uptime monitoring system generated 932 false outage alerts. The root cause was file descriptor exhaustion caused by too many open connections, especially from HTTP keepalives, Redis checks, and worker concurrency. The post walks through Linux limits, Docker and systemd ulimits, and the behavior of async Python components such as httpx, uvicorn, and FastAPI. It also shows how to reduce false positives by tuning connection pools, lowering keepalive pressure, and improving monitoring logic. The result is a clearer operating model for stable infrastructure monitoring in production.

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