code: func (az *Cloud) IsNodeUnmanagedByProviderID(providerID string) bool {
  	return !azureNodeProviderIDRE.Match([]byte(providerID))
  }
docs: // IsNodeUnmanagedByProviderID returns true if the node is not managed by Azure cloud provider.
  // All managed node's providerIDs are in format 'azure:///subscriptions/<id>/resourceGroups/<rg>/providers/Microsoft.Compute/.*'