code: func (kl *Kubelet) getPodPluginDir(podUID types.UID, pluginName string) string {
  	return filepath.Join(kl.getPodPluginsDir(podUID), pluginName)
  }
docs: // getPodPluginDir returns a data directory name for a given plugin name for a
  // given pod UID.  Plugins can use these directories to store data that they
  // need to persist.  For non-per-pod plugin data, see getPluginDir.