code: def _get_pod_uid(self, labels):
          
          namespace = CadvisorPrometheusScraperMixin._get_container_label(labels, "namespace")
          pod_name = CadvisorPrometheusScraperMixin._get_container_label(labels, "pod_name")
          return self.pod_list_utils.get_uid_by_name_tuple((namespace, pod_name))
docs: Return the id of a pod
          :param labels:
          :return: str or None