code: func (e *Exporter) getMemPoolDepth() error {
  	res, err := e.service.UnconfirmedTxs(maxUnconfirmedTxsToFetch)
  	if err != nil {
  		return err
  	}
  	e.datum.UnconfirmedTxs = float64(res.NumTxs)
  	return nil
  }
docs: // Get unconfirmed_transactions