docs: def _create_kube_dns_instance(self, instance):
          """
          Set up kube_dns instance so it can be used in OpenMetricsBaseCheck
          """
          kube_dns_instance = deepcopy(instance)
  
          # kube_dns uses 'prometheus_endpoint' and not 'prometheus_url', so we have to rename the key
          kube_dns_instance['prometheus_url'] = instance.get('prometheus_endpoint', None)
  
          kube_dns_instance.update(
              {
                  'namespace': 'kubedns',
                  # Note: the count metrics were moved to specific functions list below to be submitted
                  # as both gauges and monotonic_counts
                  'metrics': [
                      {
                          # metrics have been renamed to kubedns in kubernetes 1.6.0
                          'kubedns_kubedns_dns_response_size_bytes': 'response_size.bytes',
                          'kubedns_kubedns_dns_request_duration_seconds': 'request_duration.seconds',
                          # metrics names for kubernetes < 1.6.0
                          'skydns_skydns_dns_response_size_bytes': 'response_size.bytes',
                          'skydns_skydns_dns_request_duration_seconds': 'request_duration.seconds',
                      }
                  ],
                  # Defaults that were set when kube_dns was based on PrometheusCheck
                  'send_monotonic_counter': instance.get('send_monotonic_counter', False),
                  'health_service_check': instance.get('health_service_check', False),
              }
          )
  
          return kube_dns_instance