code: func isMasterNode(node *v1.Node) bool {
  	if val, ok := node.Labels[nodeLabelRole]; ok && val == "master" {
  		return true
  	}
  
  	return false
  }
docs: // isMasterNode returns true if the node has a master role label.
  // The master role is determined by looking for:
  // * a kubernetes.io/role="master" label