Which AWS service or feature can initiate an Amazon EC2 Auto Scaling action to achieve this goal?

Explanations:

Amazon Simple Queue Service (Amazon SQS) is used for message queuing, not for triggering EC2 Auto Scaling actions.

Amazon Simple Notification Service (Amazon SNS) is used for message notifications but does not trigger EC2 Auto Scaling actions directly.

AWS Systems Manager provides operational insights and automation, but it is not specifically used to initiate EC2 Auto Scaling actions based on metrics like CPU utilization.

Amazon CloudWatch alarms monitor specified metrics and can trigger EC2 Auto Scaling actions, such as adding or removing instances based on CPU utilization thresholds.