code: func getSdcGUIDLabel(plug *sioPlugin) (string, error) {
  	nodeLabels, err := plug.host.GetNodeLabels()
  	if err != nil {
  		return "", err
  	}
  	label, ok := nodeLabels[sdcGUIDLabelName]
  	if !ok {
  		klog.V(4).Info(log("node label %s not found", sdcGUIDLabelName))
  		return "", nil
  	}
  
  	klog.V(4).Info(log("found node label %s=%s", sdcGUIDLabelName, label))
  	return label, nil
  }
docs: // getSdcGUIDLabel fetches the scaleio.sdcGuid node label
  // associated with the node executing this code.