Cloudflare's Toxic Combinations: A Practical Compound-Signal Checklist for Incident Prevention
Your deploy was fine. Your WAF rule update was also fine. Both hitting the same service within fifteen minutes at 2 a.m.? That is where the outage lives, and your single-metric dashboards will smile green the entire time. Cloudflare wrote an entire postmortem about this blind spot — stacked low-signal anomalies that every alert evaluates in isolation and nobody evaluates together — so I turned it into an enforceable playbook before the next on-call learns the lesson the hard way.
