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I have a couple separate instance groups, and kubectl top nodes will display the CPU and Memory usage of all nodes. I'd like to be able to just ask for the information for a specific instance group if possible.

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Do your instance groups have labels identifying the groups they belong to? If so, you can filter to them using the -l/--selector option, like so:

kubectl top nodes --selector instance-group=group-1

This assumes that the label name is instance-group and the label value for the group you want to query is group-1.

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