Grafana dashboard: ZFS

Metrics collected using `zpool_influxdb` [command](https://github.com/openzfs/zfs/tree/master/cmd/zpool_influxdb) and telegraf `zfs` input [plugin](https://github.com/influxdata/telegraf/blob/master/plugins/inputs/zfs/README.md) (used only in ARC and L2 ARC) and scraped by Prometheus using `prometheus_client` [plugin](https://github.com/influxdata/telegraf/tree/master/plugins/outputs/prometheus_client)

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              "legendFormat": "pending",
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            }
          ],
          "title": "Scrub",
          "type": "timeseries"
        }
      ],
      "repeat": "pool",
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    }
  ],
  "refresh": false,
  "schemaVersion": 30,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": [
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(zpool_stats_size, instance)",
        "description": null,
        "error": null,
        "hide": 0,
        "includeAll": false,
        "label": null,
        "multi": false,
        "name": "instance",
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        "query": {
          "query": "label_values(zpool_stats_size, instance)",
          "refId": "StandardVariableQuery"
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        "regex": "",
        "skipUrlSync": false,
        "sort": 1,
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      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(zpool_stats_size{instance=\"$instance\", vdev=\"root\"}, name)",
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        "hide": 0,
        "includeAll": true,
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        "skipUrlSync": false,
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      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(zpool_stats_size{instance=\"$instance\", name=~\"$pool\", vdev!~\"root\", path=\"\"}, vdev)",
        "description": null,
        "error": null,
        "hide": 0,
        "includeAll": true,
        "label": "VDEV",
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        "name": "vdev",
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          "query": "label_values(zpool_stats_size{instance=\"$instance\", name=~\"$pool\", vdev!~\"root\", path=\"\"}, vdev)",
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        "skipUrlSync": false,
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    ]
  },
  "time": {
    "from": "now-3h",
    "to": "now"
  },
  "timepicker": {},
  "timezone": "",
  "title": "ZFS",
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  "version": 89
}