code: func (p *Plugin) Watch(resyncName string, changeChan chan datasync.ChangeEvent,
  	resyncChan chan datasync.ResyncEvent, keyPrefixes ...string) (datasync.WatchRegistration, error) {
  
  	return p.registry.Watch(resyncName, changeChan, resyncChan, keyPrefixes...)
  }
docs: // Watch adds entry to the plugin.registry. By doing this, other plugins will receive notifications
  // about data changes and data resynchronization.
  //
  // This method is supposed to be called in Plugin.Init().
  // Calling this method later than kvdbsync.Plugin.AfterInit() will have no effect
  // (no notifications will be received).