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You can make use of CloudWatch search expression syntax to create a single CloudWatch alarm that tracks CPU Utilization across all EC2 instances. For example, you can create a search expression that displays the AWS/EC2 CPUUtilization metric for all instances in the Region. If you later launch a new instance, the CPUUtilization of the new instance is automatically added to the graph. See reference document.
SEARCH('{AWS/EC2,InstanceId} MetricName="CPUUtilization"', 'Average')
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I don't know if this used to work but it doesn't as of March 2024. An error message is displayed "You cannot create an alarm on a math expression containing the SEARCH function"