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