An ecommerce company wants Auto Scaling to add or remove EC2 instances based on CPU usage. Which AWS feature or service can trigger an Amazon EC2 Auto Scaling action to do this?
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Correct answer: Amazon CloudWatch alarm.
Why this is the answer
An Amazon CloudWatch alarm is the correct choice because it monitors metrics (like CPU utilization) and can trigger automated actions when a threshold is breached. In this scenario, a CloudWatch alarm configured to monitor the average CPU usage of EC2 instances can initiate an Auto Scaling action to add or remove instances. Amazon SQS is a message queuing service, not for monitoring and triggering scaling. Amazon SNS is a notification service for sending messages, not for directly triggering Auto Scaling based on metrics. AWS Systems Manager is a collection of tools for operational insights and actions, but it doesn't directly trigger Auto Scaling based on performance metrics; CloudWatch is the dedicated service for that.
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