Grafana dashboard: Node Exporter from Agent Integration

This dashboard will let you visualise node_exporter metrics as sent by the Grafana Cloud Agent - https://github.com/grafana/agent

Sample agent config file:

```
server:
  log_level: info
  http_listen_port: 12345
prometheus:
  wal_directory: /tmp/wal
  global:
    scrape_interval: 15s
integrations:
  agent:
    enabled: true
  node_exporter:
    enabled: true
 
  ## Remove the commented out section below and replace REMOTE_WRITE_URL,
  ## REMOTE_WRITE_USERNAME, and REMOTE_WRITE_PASSWORD with the appropriate
  ## values for your specific Grafana Cloud Prometheus instance.
  prometheus_remote_write:
   - url: https://prometheus-us-central1.grafana.net/api/prom/push
     basic_auth:
       username: <your-username>
password: <your-password>
```

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      "name": "DS_HMPROM",
      "label": "HMPROM",
      "description": "",
      "type": "datasource",
      "pluginId": "prometheus",
      "pluginName": "Prometheus"
    }
  ],
  "__requires": [
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      "id": "bargauge",
      "name": "Bar gauge",
      "version": ""
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      "id": "graph",
      "name": "Graph",
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    },
    {
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      "id": "prometheus",
      "name": "Prometheus",
      "version": "1.0.0"
    },
    {
      "type": "panel",
      "id": "singlestat",
      "name": "Singlestat",
      "version": ""
    }
  ],
  "annotations": {
    "list": [
      {
        "builtIn": 1,
        "datasource": "-- Grafana --",
        "enable": true,
        "hide": true,
        "iconColor": "rgba(0, 211, 255, 1)",
        "name": "Annotations & Alerts",
        "type": "dashboard"
      }
    ]
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  "editable": true,
  "gnetId": 12558,
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  "links": [
    {
      "$$hashKey": "object:1884",
      "icon": "external link",
      "tags": [],
      "targetBlank": true,
      "title": "Update node_exporter",
      "tooltip": "",
      "type": "link",
      "url": "https://github.com/prometheus/node_exporter/releases"
    }
  ],
  "panels": [
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      "colorPostfix": false,
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        "lineColor": "rgb(31, 120, 193)",
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      "targets": [
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          "expr": "sum(time() - node_boot_time_seconds{agent_hostname=~\"$hostname\"})",
          "format": "time_series",
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      "tableColumn": "",
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        {
          "expr": "sum(node_memory_MemTotal_bytes{agent_hostname=~\"$hostname\"})",
          "format": "time_series",
          "instant": true,
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          "legendFormat": "{{instance}}",
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      ],
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        },
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          "legendFormat": "CPU Busy",
          "refId": "A"
        },
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          "instant": true,
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        },
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        },
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        },
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      "timeShift": null,
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        "irq": "#BF1B00",
        "nice": "#C15C17",
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        "softirq": "#E24D42",
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          "alias": "/.*_Total/",
          "color": "#C4162A",
          "fill": 0
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      ],
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      "steppedLine": false,
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      "dashes": false,
      "datasource": "${DS_HMPROM}",
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      "fieldConfig": {
        "defaults": {
          "custom": {}
        },
        "overrides": []
      },
      "fill": 0,
      "fillGradient": 1,
      "gridPos": {
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        "y": 0
      },
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      "steppedLine": false,
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          "instant": false,
          "interval": "",
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          "legendFormat": "filefd_{{agent_hostname}}",
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        },
        {
          "expr": "irate(node_context_switches_total{agent_hostname=~\"$hostname\"}[30m])",
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        },
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          "intervalFactor": 1,
          "legendFormat": "",
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        },
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      },
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        "lineColor": "#3274D9",
        "show": true,
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        "ymin": null
      },
      "tableColumn": "",
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        {
          "expr": "avg(irate(node_cpu_seconds_total{agent_hostname=~\"$hostname\",mode=\"iowait\"}[30m])) * 100",
          "format": "time_series",
          "hide": false,
          "instant": false,
          "interval": "",
          "intervalFactor": 1,
          "legendFormat": "",
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      ],
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      "timeShift": null,
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        "5分钟": "#CCA300"
      },
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        },
        "overrides": []
      },
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      },
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      },
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      "linewidth": 2,
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