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A quick test that confirms an app or service is alive and responding correctly.
Health checks help deploy platforms and monitors decide whether a service is safe to receive traffic. A good check tests the critical path, not just any response.
Plainly
Think of Health Check as the checklist that keeps the app open for real people. A quick test that confirms an app or service is alive and responding correctly.
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.