Which solution meets these requirements?
Create an Amazon CloudWatch agent configuration for the workload. Store the CloudWatch agent configuration in an Amazon S3 bucket. Write an EC2 user data script to fetch the configuration file from Amazon S3. Configure the CloudWatch agent on the instance during initial boot.
Create an Amazon CloudWatch agent configuration for the workload in AWS Systems Manager Parameter Store. Create a Systems Manager document that installs and configures the CloudWatch agent by using the configuration. Create an Amazon EventBridge (Amazon CloudWatch Events) rule on the default event bus with a Systems Manager Run Command target that runs the document whenever an instance enters the running state.
Create an Amazon CloudWatch agent configuration for the workload. Create an AWS Lambda function to install and configure the CloudWatch agent by using AWS Systems Manager Session Manager. Include the agent configuration inside the Lambda package. Create an AWS Config custom rule to identify changes to the EC2 instances and invoke Lambda function.
Create an Amazon CloudWatch agent configuration for the workload. Save the CloudWatch agent configuration as part of an AWS Lambda deployment package. Use AWS CloudTrail to capture EC2 tagging events and initiate agent installation. Use AWS CodeBuild to configure the CloudWatch agent on the instances that run the workload.
Explanations:
Storing the CloudWatch agent configuration in an S3 bucket and using a user data script is a valid approach but less efficient than using Systems Manager, which offers centralized management and automation for instance configuration.
Using Systems Manager to store the configuration and trigger agent installation via a Run Command through EventBridge is an efficient, automated, and scalable approach for handling new EC2 instances in an Auto Scaling group.
This option is overly complex with the unnecessary use of AWS Lambda, AWS Config, and Systems Manager Session Manager. It introduces complexity and overhead that could be avoided with a simpler solution like Option B.
Using AWS Lambda and AWS CloudTrail to install the CloudWatch agent based on EC2 tagging events is an inefficient solution for this use case. It overcomplicates the process compared to using Systems Manager.
I think the answer is:
Create an Amazon CloudWatch agent configuration for the workload in AWS Systems Manager Parameter Store. Create a Systems Manager document that installs and configures the CloudWatch agent by using the configuration. Create an Amazon EventBridge (Amazon CloudWatch Events) rule on the default event bus with a Systems Manager Run Command target that runs the document whenever an instance enters the running state.