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A single AWS zone failure turned into an 18-hour Coinbase outage. The postmortem reveals two specific ways 'multi-AZ' architecture quietly wasn't, and how to check your own systems for the same gap.
Most postmortems document everything and change nothing. The failure is in the document design, not the analysis. Here is the structure that works for the three distinct readers every incident review actually has.
Most engineering postmortems are structurally correct and practically useless outside the team that wrote them. The problem is not the template — it is that postmortems are written for the author, not the reader.
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