I've seen metrics for re-transmits from the master node. The master node appears to be experiencing the majority of re-transmits in the cluster (not the worker-nodes). This makes me think this is expected and possibly how Listeners and Informers work between the clients of the Kube API and the server working on the Master node.

Are re-transmits part of the underlying implementation? And therefor are re-transmits from master nodes to worker-nodes in a Kubernetes cluster normal?