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Continuous watching of app health, errors, latency, and important business flows.
Monitoring tells you when production is failing before users complain. Good monitors cover technical health and product-critical actions like signup or checkout.
Plainly
Think of Monitoring as the checklist that keeps the app open for real people. Continuous watching of app health, errors, latency, and important business flows.
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.