Does anyone know why we are experiencing on our kubernetes master node some system load peaks. I thought that the master node is not doing anything except monitoring our agent nodes.

Each time we have a system load peak of 1.8-2 on our dual-core machine, I see in the kube-controller-manager log that the master tries to start 3 things:

• controllermanager.go:373] Attempting to start disruption controller
• controllermanager.go:385] Attempting to start petset
• controllermanager.go:460] Attempting to start certificates

Our kubernetes version is 1.4.6 and is created via the azure portal. The system peaks can we see via datadog monitoring.