code: func (daemon *Daemon) LogVolumeEvent(volumeID, action string, attributes map[string]string) {
  	actor := events.Actor{
  		ID:         volumeID,
  		Attributes: attributes,
  	}
  	daemon.EventsService.Log(action, events.VolumeEventType, actor)
  }
docs: // LogVolumeEvent generates an event related to a volume.