code: func (m TaskManager) checkBuildStatusLater(c context.Context, ctl task.Controller) {
  	// TODO(vadimsh): Make the check interval configurable?
  	if !ctl.State().Status.Final() {
  		ctl.AddTimer(c, statusCheckTimerInterval, statusCheckTimerName, nil)
  	}
  }
docs: // checkBuildStatusLater schedules a delayed call to checkBuildStatus if the
  // invocation is still running.
  //
  // This is a fallback mechanism in case PubSub notifications are delayed or
  // lost for some reason.