{
  "title": "System Resources",
  "uid": "system-resources",
  "schemaVersion": 38,
  "version": 1,
  "refresh": "30s",
  "time": { "from": "now-1h", "to": "now" },
  "panels": [
    {
      "id": 1,
      "title": "CPU Usage (%)",
      "type": "timeseries",
      "gridPos": { "x": 0, "y": 0, "w": 12, "h": 8 },
      "targets": [
        {
          "expr": "100 - (avg(rate(node_cpu_seconds_total{mode=\"idle\"}[5m])) * 100)",
          "legendFormat": "CPU %"
        }
      ]
    },
    {
      "id": 2,
      "title": "Memory Usage (%)",
      "type": "timeseries",
      "gridPos": { "x": 12, "y": 0, "w": 12, "h": 8 },
      "targets": [
        {
          "expr": "(1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) * 100",
          "legendFormat": "Memory %"
        }
      ]
    },
    {
      "id": 3,
      "title": "Disk Usage (%)",
      "type": "timeseries",
      "gridPos": { "x": 0, "y": 8, "w": 12, "h": 8 },
      "targets": [
        {
          "expr": "(1 - node_filesystem_avail_bytes{mountpoint=\"/\"} / node_filesystem_size_bytes{mountpoint=\"/\"}) * 100",
          "legendFormat": "Disk %"
        }
      ]
    },
    {
      "id": 4,
      "title": "Network I/O (bytes/s)",
      "type": "timeseries",
      "gridPos": { "x": 12, "y": 8, "w": 12, "h": 8 },
      "targets": [
        {
          "expr": "rate(node_network_receive_bytes_total{device!=\"lo\"}[5m])",
          "legendFormat": "rx {{device}}"
        },
        {
          "expr": "rate(node_network_transmit_bytes_total{device!=\"lo\"}[5m])",
          "legendFormat": "tx {{device}}"
        }
      ]
    }
  ]
}