What should the DevOps engineer do next to meet the requirements?
Create an AWS Step Functions workflow to check the state of the CloudWatch alarm. Configure the Step Functions workflow to exit with an error if the alarm is in the ALARM state. Create a new stage in the pipeline between each Region deployment stage. In each new stage, include an action to invoke the Step Functions workflow.
Configure an AWS CodeDeploy application to deploy a CloudFormation template with automatic rollback. Configure the CloudWatch alarm as the instance health check for the CodeDeploy application. Remove the CloudFormation actions from the pipeline. Create a CodeDeploy action in the pipeline stage for each Region.
Create a new pipeline stage for each Region where the application is deployed. Configure a CloudWatch alarm action for the new stage to check the state of the CloudWatch alarm and to exit with an error if the alarm is in the ALARM state
Configure the CloudWatch agent on the EC2 instances to report the application status to the Route 53 health check. Create a new pipeline stage for each Region where the application is deployed. Configure a CloudWatch alarm action to exit with an error if the CloudWatch alarm is in the ALARM state.
Explanations:
This option correctly implements an AWS Step Functions workflow to monitor the CloudWatch alarm, ensuring that the pipeline does not proceed to the next region until the application is confirmed healthy. It creates a structured way to manage the sequential health check process between deployments across multiple regions.
This option suggests using AWS CodeDeploy with automatic rollback and removing the CloudFormation actions, which changes the deployment strategy significantly. While CodeDeploy can handle health checks, it is not necessary to abandon CloudFormation actions or create a CodeDeploy application for this scenario, as it complicates the pipeline structure unnecessarily.
This option proposes adding a CloudWatch alarm action directly to the pipeline stages. However, CloudWatch alarms cannot be directly invoked as actions in CodePipeline. Instead, a Step Functions workflow or other monitoring logic would be needed to check the state of the alarms.
This option suggests configuring the CloudWatch agent to report application status to Route 53 health checks, which is unnecessary for this scenario. Additionally, it incorrectly implies that a CloudWatch alarm action can be used in CodePipeline, which is not feasible as alarms do not trigger actions directly.
I appraise that the answer is:
Create an AWS Step Functions workflow to check the state of the CloudWatch alarm. Configure the Step Functions workflow to exit with an error if the alarm is in the ALARM state. Create a new stage in the pipeline between each Region deployment stage. In each new stage, include an action to invoke the Step Functions workflow.