Today heapster is enabled by default for both GKE and GCE for monitoring, but it doesn't collect stats from master node. The reason is master node is never register itself to apiserver. I remembered either me or @vishh filed the issue before. But back then, the decision is we are going to use collectd + GCM as the default solution for both GKE and GCE. But decision was changed later, then I filed #9028.

Now I realized that we missed monitoring on master node for both GKE and GCE. cc/ @brendandburns @alex-mohr @roberthbailey @thockin @vishh @saad-ali