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On-Call is a delivery or reliability concept that helps teams ship changes, watch production, and recover quickly.
On-Call 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 On-Call 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 On-Call.