GetHostname returns OS's hostname if 'hostnameOverride' is empty; otherwise, return 'hostnameOverride'.

GetNodeHostIP returns the provided node's IP, based on the priority: 1.

GetNodeIP returns the ip of node with the provided hostname.

GetPreferredNodeAddress returns the address of the provided node, using the provided preference order.

GetZoneKey is a helper function that builds a string identifier that is unique per failure-zone; it returns empty-string for no zone.

PatchNodeCIDR patches the specified node's CIDR to the given value.

PatchNodeStatus patches node status.

SetNodeCondition updates specific node condition with patch operation.

NodeUnreachablePodMessage is the message on a pod when its state cannot be confirmed as kubelet is unresponsive on the node it is (was) running.

NodeUnreachablePodReason is the reason on a pod when its state cannot be confirmed as kubelet is unresponsive on the node it is (was) running.