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System Design Masterclass · Reliability Resilience
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Cloudflare's July 2019 WAF regex incident went from alert to full recovery in 55 minutes. Atlassian's April 2022 data deletion incident ran for roughly 19 hours before restoration was complete. Both companies employ excellent engineers. The difference was not talent. The difference was process.
Cloudflare had rehearsed severity states, standing IC rotations, and a clear mitigation-first protocol. Their IC made a bold call (disable WAF globally) within 27 minutes because the authority to make that call was pre-assigned and unambiguous. Atlassian's published postmortem identifies missed handoffs, premature resolution declarations, and unclear role assignments as direct contributors to the extended timeline.
Incident management is the scaffolding that separates those two outcomes. It is not about having smarter engineers. It is about having a process that works at 3 AM when nobody is at their best. This lesson covers the state machine that a well-run incident follows, the role split that prevents chaos, and the specific process failures that turn 30-minute incidents into day-long ones.