autoRollback

(Optional) Indicates whether to roll back the Auto Scaling group to its previous configuration if the instance refresh fails or a CloudWatch alarm threshold is met. The default is false.

A rollback is not supported in the following situations:

• There is no desired configuration specified for the instance refresh.

• The Auto Scaling group has a launch template that uses an Amazon Web Services Systems Manager parameter instead of an AMI ID for the ImageId property.

• The Auto Scaling group uses the launch template's $Latest or $Default version.

For more information, see Undo changes with a rollback in the Amazon EC2 Auto Scaling User Guide.