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AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

An e-commerce company runs a stateful payment service on an Auto Scaling group of Amazon EC2 instances. The CloudWatch agent publishes the mem_used_percent metric from each instance. When the mem_used_percent metric exceeds 90% for 2 consecutive minutes, the company wants the affected instance to be gracefully rebooted through the AWS-RestartEC2Instance Systems Manager Automation runbook. Which approach requires the LEAST operational overhead?

  • Attach a step-scaling policy that uses the mem_used_percent metric to increase desired capacity by one, allowing Auto Scaling to terminate and replace the over-utilized instance.

  • Create a CloudWatch alarm for the mem_used_percent metric on each instance. Configure an EventBridge rule to be triggered by the alarm state change, invoking the AWS-RestartEC2Instance Systems Manager Automation runbook with the alarmed instance ID as a target.

  • Install a cron script on every instance that checks the mem_used_percent metric each minute and calls Systems Manager Run Command to reboot the instance when the threshold is reached.

  • Create an SSM State Manager association that runs the AWS-RunShellScript document every minute to evaluate memory usage and reboot the instance if the threshold is breached.

AWS Certified CloudOps Engineer Associate SOA-C03
Monitoring, Logging, Analysis, Remediation, and Performance Optimization
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