"cluster_not_found_response_code": "INTERNAL_SERVER_ERROR",
           "max_grpc_timeout": "0s"
          },
          "metadata": {
           "filter_metadata": {
            "istio": {
             "config": "/apis/networking.istio.io/v1alpha3/namespaces/default/virtual-service/http-0-istio-autogenerated-k8s-gateway"
            }
           }
          },
          "decorator": {

          "format": "time_series",
          "hide": true,
          "intervalFactor": 2,
          "legendFormat": "heap alloc",
          "refId": "D"
        },
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${datasource}"
          },
          "expr": "go_memstats_alloc_bytes{app=\"istiod\"}",

            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "expr": "sum(pilot_xds_cds_reject{app=\"istiod\"}) or (absent(pilot_xds_cds_reject{app=\"istiod\"}) - 1)",
              "format": "time_series",
              "hide": false,
              "intervalFactor": 1,
              "legendFormat": "Rejected CDS Configs",

             503
            ]
           },
           "max_grpc_timeout": "0s"
          },
          "metadata": {
           "filter_metadata": {
            "istio": {
             "config": "/apis/networking.istio.io/v1alpha3/namespaces/default/virtual-service/httpbin"
            }
           }
          },
          "decorator": {
           "operation": "httpbin.default.svc.cluster.local:8000/get*"