dolphinDB cluster
manage dolphinDB cluster
a dashboard for management of dolphinDB, include serveral parts: 
1. instance
2. computenode
3. datanode
4. streaming  

very simple and easy to use.
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            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
          "fieldConfig": {
            "defaults": {
              "color": {
                "mode": "palette-classic"
              },
              "custom": {
                "axisLabel": "",
                "axisPlacement": "auto",
                "barAlignment": 0,
                "drawStyle": "line",
                "fillOpacity": 0,
                "gradientMode": "none",
                "hideFrom": {
                  "legend": false,
                  "tooltip": false,
                  "viz": false
                },
                "lineInterpolation": "linear",
                "lineWidth": 1,
                "pointSize": 5,
                "scaleDistribution": {
                  "type": "linear"
                },
                "showPoints": "auto",
                "spanNulls": false,
                "stacking": {
                  "group": "A",
                  "mode": "none"
                },
                "thresholdsStyle": {
                  "mode": "off"
                }
              },
              "mappings": [],
              "thresholds": {
                "mode": "absolute",
                "steps": [
                  {
                    "color": "green"
                  },
                  {
                    "color": "red",
                    "value": 80
                  }
                ]
              }
            },
            "overrides": []
          },
          "gridPos": {
            "h": 8,
            "w": 12,
            "x": 0,
            "y": 4
          },
          "id": 30,
          "options": {
            "legend": {
              "calcs": [],
              "displayMode": "list",
              "placement": "bottom"
            },
            "tooltip": {
              "mode": "single",
              "sort": "none"
            }
          },
          "targets": [
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${DS_PROMETHEUS}"
              },
              "expr": "lastMsgLatency{job=\"DolphinDB\"}",
              "refId": "A"
            }
          ],
          "title": "message latency",
          "type": "timeseries"
        }
      ],
      "title": "Streaming",
      "type": "row"
    }
  ],
  "refresh": "30s",
  "schemaVersion": 36,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": []
  },
  "time": {
    "from": "now-6h",
    "to": "now"
  },
  "timepicker": {},
  "timezone": "",
  "title": "dolphinDB cluster",
  "uid": "IKy3eeQnz",
  "version": 10,
  "weekStart": "",
  "gnetId": 16194,
  "description": "manage dolphinDB cluster"
}