There should be a notification if metrics-server is missing

[bergerx]

Users may be confused with inconsistent outputs of the same command on different environments.

kubectl-status tries to query and incorporate information from related resources (e.g. Kind: NodeMetrics are included to Kind: Nodes result) if they are available.

kubectl-status should display a notification when such resources are not available to include some extra bit of information.

An example that shows how kubectl top reports missing metrics-server.

$ kubectl top node
error: Metrics API not available