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Postmortem is a delivery or reliability concept that helps teams ship changes, watch production, and recover quickly.
Postmortem matters because release quality is the gap between local proof and live proof under real traffic. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Postmortem as a checklist or dashboard for keeping the app alive. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it to separate local success, preview success, production success, and revenue-critical success. In practice, name the owner, input, output, failure mode, and proof before relying on Postmortem.