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The percentage of time a service is available and working.
Uptime is a reliability signal, but it only matters if the measured service reflects what users need. A page can load while checkout or login is still broken.
Plainly
Think of Uptime as the checklist that keeps the app open for real people. The percentage of time a service is available and working.
In practice
Use it when a change has to survive deploys, users, incidents, analytics, or billing reality. In practice, define the owner, input, output, and failure mode before you rely on it.