docs: def _label_to_tag(self, name, labels, scraper_config, tag_name=None):
          """
          Search for `name` in labels name and returns corresponding tag string.
          Tag name is label name if not specified.
          Returns None if name was not found.
          """
          value = labels.get(name)
          if value:
              return self._format_tag(tag_name or name, value, scraper_config)
          else:
              return None