Crucial Exams

AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

A company runs a long-running scientific simulation on a single Amazon EC2 instance. The CloudWatch agent publishes a custom MemoryUtilization metric. If memory usage stays above 90 percent for 5 consecutive minutes, an existing Systems Manager Automation runbook must clear application caches on that same instance automatically, without manual intervention. Which approach meets these requirements with the least operational overhead?

  • Create a CloudWatch alarm for MemoryUtilization > 90 percent for 5 datapoints. Add an EventBridge rule that filters for the alarm's ALARM state and sets the existing Systems Manager Automation runbook as the target. Use an input transformer to pass the InstanceId from the event to the runbook.

  • Define a Systems Manager Maintenance Window that executes the cache-clearing runbook every 10 minutes, with a pre-task script that exits if memory usage is below 90 percent.

  • Create a CloudWatch alarm and an EventBridge rule that invokes an AWS Lambda function. The function reads the InstanceId from the event and calls StartAutomationExecution to run the cache-clearing runbook on that instance.

  • Place the instance in an Auto Scaling group with a step-scaling policy based on MemoryUtilization and use a lifecycle hook to run the cache-clearing runbook when the group scales out.

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