docs: def _get_hostname(self, hostname, metric):
          """
          If hostname is None, look at label_to_hostname setting
          """
          if hostname is None and self.label_to_hostname is not None:
              for label in metric.label:
                  if label.name == self.label_to_hostname:
                      return label.value + self.label_to_hostname_suffix
  
          return hostname