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Amazon ECS introduces early success criteria for faster rollouts, limits automatic rollback

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Amazon ECS has introduced a new feature called earlySuccessCriteria for its rolling deployment strategy. Available in all commercial regions and GovCloud (US) since September 2026, this feature allows a deployment to be marked as successful once a specified percentage of new tasks are healthy. By setting a 'healthyPercent' threshold, developers can complete deployments faster, particularly for services using specialized hardware like GPUs or those with long-lived connections. However, once this success threshold is met, the circuit breaker and alarm-based automatic rollback mechanisms are no longer available for the service.

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