code: func (lvs labelNamesValues) ToLabels() stdprometheus.Labels {
  	labels := stdprometheus.Labels{}
  	for i := 0; i < len(lvs); i += 2 {
  		labels[lvs[i]] = lvs[i+1]
  	}
  	return labels
  }
docs: // ToLabels is a convenience method to convert a labelNamesValues
  // to the native prometheus.Labels.