Grafana dashboard: Nomad Cluster
Description: Nomad built-in telemetry https://github.com/dereknex/nomad-grafana

Prometheus Job :
```
- job_name: nomad_metrics
  params:
    format:
    - prometheus
  scrape_interval: 5s
  scrape_timeout: 5s
  metrics_path: /v1/metrics
  scheme: https
  consul_sd_configs:
  - server: <consul_addr>
    token: <secret>
    datacenter: <dc>
    tag_separator: ','
    scheme: http
    services:
    - nomad-client
    - nomad
  bearer_token: <secret>
  tls_config:
    insecure_skip_verify: true
  relabel_configs:
  - source_labels: [__meta_consul_tags]
    separator: ;
    regex: (.*)http(.*)
    replacement: $1
    action: keep
  - source_labels: [__meta_consul_address]
    separator: ;
    regex: (.*)
    target_label: __meta_consul_service_address
    replacement: $1
    action: replace
```

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      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    }
  ],
  "refresh": "1m",
  "schemaVersion": 16,
  "style": "dark",
  "tags": [
    "nomad",
    "host",
    "cluster"
  ],
  "templating": {
    "list": [
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "hide": 0,
        "includeAll": false,
        "label": "DC",
        "multi": false,
        "name": "datacenter",
        "options": [],
        "query": "label_values(nomad_client_uptime, datacenter)",
        "refresh": 1,
        "regex": "",
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "hide": 0,
        "includeAll": true,
        "label": "Host",
        "multi": true,
        "name": "host",
        "options": [],
        "query": "label_values(nomad_client_uptime{datacenter=~\"$datacenter\"}, host)",
        "refresh": 1,
        "regex": "",
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-15m",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ],
    "time_options": [
      "5m",
      "15m",
      "1h",
      "6h",
      "12h",
      "24h",
      "2d",
      "7d",
      "30d"
    ]
  },
  "timezone": "",
  "title": "Nomad Cluster",
  "uid": "CiP3mZVik",
  "version": 26,
  "description": "Nomad built-in telemetry https://github.com/dereknex/nomad-grafana"
}