Train, Flag, Rollout: The Fast Deck
Recall the distinct jobs of the release train, feature flag, and phased rollout.
What is the primary job of the release train? Coordinate integrated work and expose dependency truth before production day. The train is about synchronized readiness across teams, not immediate customer exposure. Deployment vs. release Flags let you separate these on purpose. “If it boarded the train, why not just turn it on for everyone?” A stakeholder confuses integrated readiness with exposure readiness. Boarding the train means the increment is coordinated and deployable. Broad exposure still depends on support, failure-mode checks, and staged rollout evidence. Say this Do not answer with “because process says so.” It re-links the train to coordination…
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