IsKubeletLabel returns true if the label key is one that kubelets are allowed to set on their own Node object.

KubeletLabelNamespaces returns the list of label key namespaces kubelets are allowed to set on their own Node objects.

KubeletLabels returns the list of label keys kubelets are allowed to set on their own Node objects.

When kubelet is started with the "external" cloud provider, then it sets this annotation on the node to denote an ip address set from the cmd line flag (--node-ip).

The OS/Arch labels are promoted to GA in 1.14.