docs: public static MetricDescriptor create(
        String name, String description, String unit, Type type, List<LabelKey> labelKeys) {
      Utils.checkListElementNotNull(Utils.checkNotNull(labelKeys, "labelKeys"), "labelKey");
      return new AutoValue_MetricDescriptor(
          name,
          description,
          unit,
          type,
          Collections.unmodifiableList(new ArrayList<LabelKey>(labelKeys)));
    }