code: func (nDB *NetworkDB) Close() {
  	if err := nDB.clusterLeave(); err != nil {
  		logrus.Errorf("%v(%v) Could not close DB: %v", nDB.config.Hostname, nDB.config.NodeID, err)
  	}
  
  	//Avoid (*Broadcaster).run goroutine leak
  	nDB.broadcaster.Close()
  }
docs: // Close destroys this NetworkDB instance by leave the cluster,
  // stopping timers, canceling goroutines etc.