At 03:11 on a Tuesday, hard bounces on our marketing vendor tripled in ninety seconds. Nobody was awake. Nobody needed to be.
The breaker tripped at 03:12, traffic weighted onto the fallback vendor, and the queue drained without a single lost message. The AI diagnosis — a reputation dip tied to one campaign segment — was waiting in the incident channel.
The postmortem wrote itself from the routing ledger. Total human involvement: one approval tap, from a phone, at 03:14.