Grafana Node Graph 使用教程

Grafana 可以显示图数据，例：

依赖

• Grafana >= 7.5.0
  下载地址 https://grafana.com/grafana/download

# 启动 Grafana
$ ./grafana-sever

• Grafana Node Graph API Plugin

# 安装插件
$ grafana-cli plugins install hamedkarbasi93-nodegraphapi-datasource
# 重新启动 Grafana
$ grafana-server

步骤

（1）Grafana 添加数据源，选择 Node Graph API

填写 Node Graph API URL，如 http://localhost:9999

注：$URL 需要提供三个 API

• $URL/api/heatlh 健康检查接口
  • method: GET
  • 返回 HTTP CODE 200 即可
• $URL/api/graph/fields 图节点与边涉及的字段接口
  • method: GET
  • content type: application/json
  • response body example:

    {
      "edges_fields": [
        {
          "field_name": "id",
          "type": "string"
        },
        {
          "field_name": "source",
          "type": "string"
        },
        {
          "field_name": "target",
          "type": "string"
        },
        {
          "field_name": "mainStat",
          "type": "number"
        }
      ],
      "nodes_fields": [
        {
          "field_name": "id",
          "type": "string"
        },
        {
          "field_name": "title",
          "type": "string"
        },
        {
          "field_name": "mainStat",
          "type": "string"
        },
        {
          "field_name": "secondaryStat",
          "type": "number"
        },
        {
          "color": "red",
          "field_name": "arc__failed",
          "type": "number"
        },
        {
          "color": "green",
          "field_name": "arc__passed",
          "type": "number"
        },
        {
          "displayName": "Role",
          "field_name": "detail__role",
          "type": "string"
        }
      ]
    }
    

• $URL/api/graph/data 图节点与与边关系数据接口
  • method: GET
  • content type: application/json
  • response body example:

    {
        "edges": [
            {
                "id": "1",
                "mainStat": "53/s",
                "source": "1",
                "target": "2"
            }
        ],
        "nodes": [
            {
                "arc__failed": 0.7,
                "arc__passed": 0.3,
                "detail__zone": "load",
                "id": "1",
                "subTitle": "instance:#2",
                "title": "Service1"
            },
            {
                "arc__failed": 0.5,
                "arc__passed": 0.5,
                "detail__zone": "transform",
                "id": "2",
                "subTitle": "instance:#3",
                "title": "Service2"
            }
        ]
    }
    

（2）Grafana 新建 Panel，选择 Node Graph

选择对应的 Data Source 为刚刚添加的数据源

（3）得到图

参考

• https://grafana.com/docs/grafana/latest/panels-visualizations/visualizations/node-graph/ Grafana Node Graph Panel
• https://grafana.com/grafana/plugins/hamedkarbasi93-nodegraphapi-datasource/ Grafana Node Graph API