Root cause of the 2026-09-06 incident: 157 client-abandoned 408s against a
backend that was succeeding at 20-70s/call once clients stopped giving up.
Measured grounding: syslog-auto 28.8s avg / 25.4s TTFT over 888 calls;
nginx already allows 600s (Rule 5); the gap was entirely client-side.
Values: >=300s primary path, >=120s gpu-dense delegation, 2 retries with
15s/45s backoff, identified probes at 30s/hourly, batch jobs chunked +
day-scheduled. Verified live: Prometheus metrics, 0.56s syslog-auto probe,
gpu-fleet /health/unified topology.
mumuni-bot