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