code: func (l Labels) Serialize(withQuotes bool) string {
  	var tokens []string
  	tokens = append(tokens, fmt.Sprintf("heritage=%s", heritage))
  	var keys []string
  	for key := range l {
  		keys = append(keys, key)
  	}
  	sort.Strings(keys) // sort for consistency
  
  	for _, key := range keys {
  		tokens = append(tokens, fmt.Sprintf("%s/%s=%s", heritage, key, l[key]))
  	}
  	if withQuotes {
  		return fmt.Sprintf("\"%s\"", strings.Join(tokens, ","))
  	}
  	return strings.Join(tokens, ",")
  }
docs: // Serialize transforms endpoints labels into a external-dns recognizable format string
  // withQuotes adds additional quotes