# Amazon ECS deployment failure detection
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Amazon ECS provides two methods for detecting deployment failures:
+ Deployment Circuit Breaker
+ CloudWatch Alarms

Both methods can be configured to automatically roll back failed deployments to the last known good state.

Consider the following:
+ Both methods only support rolling update deployment and blue/green deployment types.
+ When both methods are used, either can trigger deployment failure.
+ The rollback method requires a previous deployment in COMPLETED state.
+ EventBridge events are generated for deployment state changes.