Canary Release: Test New Code on Real Users, Safely
A canary release is like sending a canary into a coal mine: expose a new version to a small group of users to detect problems before a full rollout. It's used to safely test changes in production by gradually shifting traffic.
A canary release acts like the proverbial canary in a coal mine. You deploy a new software version to a small subset of users to get an early warning of bugs or performance issues before exposing it to everyone. This is used to safely test changes in production by gradually shifting traffic from the old version to the new. The main footgun is conflating it with A/B testing; canaries are for quick regression checks, while A/B tests are for longer-running business experiments.
Read the original → martinfowler.com
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