A canary test is a deployment strategy where a new software version is gradually released to a small, controlled group of users before being made available to the entire user base. The term originates from the practice of using canaries in coal mines to detect toxic gases—if the canary showed signs of distress, miners knew to evacuate. Similarly, in software development, if issues emerge during a canary test, the release can be halted or rolled back before affecting all users. https://testomat.io/blog/canary-testing-the-key-to-safe-software-releases/