Make use of CodeDeploy autorollbacks in ECS service without load balancer?

Question

### Background
CDK's [`CodeDeployEcsDeployActionProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_codepipeline_actions.CodeDeployEcsDeployActionProps.html) specifies that we supply a [`deploymentGroup`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_codedeploy.EcsDeploymentGroup.html). In turn, the `EcsDeploymentGroup` requires a [`blueGreenDeploymentConfig`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_codedeploy.EcsBlueGreenDeploymentConfig.html), which looks like it can only be constructed if the ECS service is load-balanced (which for the record, make sense).

### Question
Our use case is slightly different. We have a Fargate service that is an SQS consumer and as a result, we don't have a load balancer fronting this service. However, the `CodeDeployEcsDeployAction` also has an [EcsDeploymentConfig](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_codedeploy.EcsDeploymentConfig.html) prop where I could specify canary or linear deployments.

Is there any way to pair a canary or linear deployment with autorollbacks (which seem to only be available in CodeDeploy) without having a load-balanced service?

Answer

There is an "addAlarm" that ties CloudWatch alarms to "EcsDeploymentGroup".  
I thought that using this to tie CloudWatch alarms would allow for automatic rollback even without ALBs.  
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_codedeploy.EcsDeploymentGroup.html  
https://docs.aws.amazon.com/codedeploy/latest/userguide/monitoring-create-alarms.html

Make use of CodeDeploy autorollbacks in ECS service without load balancer?

Background

Question

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