AWS DevOps Engineer Professional Practice Test

What event type should be configured in the CloudWatch Event rule to invoke a Lambda function when Trusted Advisor detects under-utilized instances?

1. Check Item Refresh Status

2. Refresh Item Status

3. Trust Advisor Check Event

4. Check Status Update

The correct answer is: Check Item Refresh Status

When configuring a CloudWatch Event rule to invoke a Lambda function based on Trusted Advisor detecting under-utilized instances, the correct event type to select is "Check Item Refresh Status." This event type specifically indicates when Trusted Advisor has updated its checks for various resources and items, thus making it suitable for triggering actions based on its findings. The "Check Item Refresh Status" event allows the system to monitor the status of checks made by Trusted Advisor, including changes in the resource utilization state. This means that once Trusted Advisor finishes evaluating the infrastructure and determines if there are under-utilized instances, this event type will signal that update. Consequently, the associated Lambda function can then be invoked to take appropriate actions in response to the detected under-utilization. Other event types, such as "Refresh Item Status" or "Trust Advisor Check Event," may not have a direct correlation with the specific condition of under-utilized instances as indicated by Trusted Advisor. They might encompass broader or different aspects of the Trusted Advisor functionality that aren’t tailored to triggering responses upon detecting specific resource statuses. Therefore, selecting the correct event type is crucial for ensuring timely and appropriate actions are carried out.