code: func (t *Target) Labels() labels.Labels {
  	lset := make(labels.Labels, 0, len(t.labels))
  	for _, l := range t.labels {
  		if !strings.HasPrefix(l.Name, model.ReservedLabelPrefix) {
  			lset = append(lset, l)
  		}
  	}
  	return lset
  }
docs: // Labels returns a copy of the set of all public labels of the target.