code: func (rc *Client) getDefaultTargets(discovery fab.DiscoveryService) ([]fab.Peer, error) {
  
  	// Default targets are discovery peers
  	peers, err := discovery.GetPeers()
  	if err != nil {
  		return nil, errors.WithMessage(err, "failed to discover peers")
  	}
  
  	// Apply default filter to discovery peers
  	targets := filterTargets(peers, rc.filter)
  
  	return targets, nil
  
  }
docs: // helper method for calculating default targets