A canary release ships a new version to a small share of users or servers first. The rollout widens only if error rates, latency and other health metrics stay within agreed limits.
Feature flags are switches in code that turn features on or off at runtime without a new deployment. Teams use them to release gradually, test with selected users and disable problems instantly.
Observability is the ability to understand what a running system is doing, and why, from the data it emits. That data is mainly logs, metrics and traces, which let engineers answer new questions without shipping new code.
A service level objective (SLO) is an internal reliability target for a service, such as the share of requests that must succeed quickly. It defines what good enough looks like for users over a rolling window.
Blue-green deployment is a release technique that keeps two identical production environments and moves traffic from the old version to the new one in one step. The old side stays ready for instant rollback.
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