"targets": [
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${datasource}"
          },
          "expr": "max(pilot_k8s_cfg_events{type=\"VirtualService\", event=\"add\"}) - (max(pilot_k8s_cfg_events{type=\"VirtualService\", event=\"delete\"}) or max(up * 0))",
          "format": "time_series",
          "intervalFactor": 1,
          "refId": "A"
        }
      ],