4 Node.js Docker Kubernetes Readiness, Liveness, and Startup Signals (Rollback-Safe Cohorts)

For Node.js applications in Docker on Kubernetes, four distinct signals—startup, liveness, readiness, and cohort outcome—are essential for managing the application lifecycle and experiment health. These signals should be treated separately to avoid incorrect actions like restarting healthy instances or failing experiments due to temporary issues. A rollback page should clearly present these distinct signals, enabling informed decisions about disabling experiments or rolling back changes based on actual user impact.

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