code: func NewBackend(kubeConfigFile string, groupVersion schema.GroupVersion, initialBackoff time.Duration) (audit.Backend, error) {
  	w, err := loadWebhook(kubeConfigFile, groupVersion, initialBackoff)
  	if err != nil {
  		return nil, err
  	}
  	return &backend{w: w, name: PluginName}, nil
  }
docs: // NewBackend returns an audit backend that sends events over HTTP to an external service.