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Rolling, Blue-Green and Canary Answer One Question: How Fast Can You Take It Back

The outcome requires putting a change into production during the day and saying beforehand what it costs; that sentence is unanswerable without knowing which shape is being used. It presupposes readiness reporting and graceful drain, since every shape assumes replacing an instance is invisible. It is the node the rollback and two-versions nodes both branch from, and its Apply question is a choice under stated constraints rather than a definition of three terms.