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How Blameless Postmortems Help Engineering Teams Learn From Outages

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A structured incident postmortem — also known as a post-incident review — is a formal analysis conducted after a production outage is resolved, aimed at identifying systemic causes rather than assigning individual blame. The blameless postmortem approach was pioneered by John Allspaw and Paul Hammond at Etsy and later codified in Google's Site Reliability Engineering book, which emphasizes that engineers always act on the best information available at the time. Engineering teams are advised to conduct postmortems within 24 to 72 hours of incident resolution, while details remain fresh and corrective actions are still actionable. Key components of an effective postmortem include a detailed timeline, root cause analysis using iterative 'why' questioning, a record of contributing factors, and clearly assigned follow-up actions. The guide also recommends running postmortems for near-miss incidents, noting they offer the same learning value as major outages but without any customer impact.

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