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How to get pod CPU usage


Anyone can help with a tip on how to get pods' CPU usage from node?
I thought I could use:
kubectl top pod podname

but I get the following error:
Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

I don't know anything about http:heapster:), is this something we should have installed and I miss it?
It supposed to be part of this class prerequisites?

Thank you in advance!




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