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Does the AWS ASG Simple Policy for CPU Utilization trigger based on the aggregate sum measure or the maximum measure?

I am referring to the sum and max statistics listed here: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_concepts.html#Statistic.

Example:

Say I have an ASG policy to create a new instance when CPU usage exceeds 50%. I have a minimum of 2 instances and a maximum of 10 instances, and I currently have 2 instances. If the aggregate sum reaches above 50%, will I get a new instance? Or will the maximum need to exceed 50% too?

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I figured the answer out by setting up a simple policy for CPU usage on my ASG. I checked the CloudWatch alarm that triggers at the policy and it is based on average.

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  • Good to know, thanks for providing an answer to your question, I was interested but couldn't find anything on the AWS site that answered it. – Tim Jun 28 '18 at 17:53