code: func DumpMetrics(ctx context.Context, task string) (string, error) {
  	gatherer := prometheus.DefaultGatherer
  	mfs, err := gatherer.Gather()
  	if err != nil {
  		return "", errors.Wrap(err, "gathering metrics")
  	}
  
  	buf := &bytes.Buffer{}
  	enc := expfmt.NewEncoder(buf, expfmt.FmtText)
  
  	for _, mf := range mfs {
  		if err := enc.Encode(mf); err != nil {
  			return buf.String(), errors.Wrap(err, "encoding metrics")
  		}
  	}
  	return buf.String(), nil
  }
docs: // DumpMetrics returns the metrics prometheus would return when collected
  // as a string, for fun and testing