Grafana dashboard: pfSense System Stats
Description: Simple network and DNS stats of pfSense with dual-WAN setup.

For the DNS stats, I'm using the unbound plugin for telegraf.

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        "total": true,
        "values": true
      },
      "lines": false,
      "linewidth": 2,
      "links": [],
      "nullPointMode": "connected",
      "paceLength": 10,
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": true,
      "steppedLine": false,
      "targets": [
        {
          "alias": "FORMERR",
          "groupBy": [
            {
              "params": [
                "auto"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "default",
          "refId": "A",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "num_answer_rcode_FORMERR"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              },
              {
                "params": [
                  "5m"
                ],
                "type": "derivative"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "router.synapse.lan"
            }
          ]
        },
        {
          "alias": "NOERROR",
          "groupBy": [
            {
              "params": [
                "auto"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "default",
          "refId": "B",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "num_answer_rcode_NOERROR"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              },
              {
                "params": [
                  "5m"
                ],
                "type": "derivative"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "router.synapse.lan"
            }
          ]
        },
        {
          "alias": "NOTIMPL",
          "groupBy": [
            {
              "params": [
                "auto"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "default",
          "refId": "C",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "num_answer_rcode_NOTIMPL"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              },
              {
                "params": [
                  "5m"
                ],
                "type": "derivative"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "router.synapse.lan"
            }
          ]
        },
        {
          "alias": "NXDOMAIN",
          "groupBy": [
            {
              "params": [
                "auto"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "default",
          "refId": "D",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "num_answer_rcode_NXDOMAIN"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              },
              {
                "params": [
                  "5m"
                ],
                "type": "derivative"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "router.synapse.lan"
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          ]
        },
        {
          "alias": "REFUSED",
          "groupBy": [
            {
              "params": [
                "auto"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "default",
          "refId": "E",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "num_answer_rcode_REFUSED"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              },
              {
                "params": [
                  "5m"
                ],
                "type": "derivative"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "router.synapse.lan"
            }
          ]
        },
        {
          "alias": "SERVFAIL",
          "groupBy": [
            {
              "params": [
                "auto"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "default",
          "refId": "F",
          "resultFormat": "time_series",
          "select": [
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              {
                "params": [
                  "num_answer_rcode_SERVFAIL"
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                "type": "field"
              },
              {
                "params": [],
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              },
              {
                "params": [
                  "5m"
                ],
                "type": "derivative"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "router.synapse.lan"
            }
          ]
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeRegions": [],
      "timeShift": null,
      "title": "DNS Reply code distribution",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ],
      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    },
    {
      "cacheTimeout": null,
      "colorBackground": false,
      "colorValue": false,
      "colors": [
        "#299c46",
        "rgba(237, 129, 40, 0.89)",
        "#d44a3a"
      ],
      "datasource": "${DS_SYNAPSE_STATS}",
      "decimals": 2,
      "format": "decbytes",
      "gauge": {
        "maxValue": 100,
        "minValue": 0,
        "show": false,
        "thresholdLabels": false,
        "thresholdMarkers": true
      },
      "gridPos": {
        "h": 3,
        "w": 5,
        "x": 0,
        "y": 38
      },
      "id": 27,
      "interval": null,
      "links": [],
      "mappingType": 1,
      "mappingTypes": [
        {
          "name": "value to text",
          "value": 1
        },
        {
          "name": "range to text",
          "value": 2
        }
      ],
      "maxDataPoints": 100,
      "nullPointMode": "connected",
      "nullText": null,
      "postfix": "",
      "postfixFontSize": "50%",
      "prefix": "",
      "prefixFontSize": "50%",
      "rangeMaps": [
        {
          "from": "null",
          "text": "N/A",
          "to": "null"
        }
      ],
      "sparkline": {
        "fillColor": "rgba(31, 118, 189, 0.18)",
        "full": false,
        "lineColor": "rgb(31, 120, 193)",
        "show": true
      },
      "tableColumn": "",
      "targets": [
        {
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                "$__interval"
              ],
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            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "autogen",
          "query": "SELECT last(\"mem_cache_rrset\") + last(\"mem_cache_message\") FROM \"internal_1yr\".\"unbound\" WHERE (\"host\" = 'router.synapse.lan') AND $timeFilter GROUP BY time($__interval) fill(null)",
          "rawQuery": true,
          "refId": "A",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "mem_cache_rrset"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "dns"
            }
          ]
        }
      ],
      "thresholds": "",
      "title": "DNS Memory Cache Size",
      "type": "singlestat",
      "valueFontSize": "80%",
      "valueMaps": [
        {
          "op": "=",
          "text": "N/A",
          "value": "null"
        }
      ],
      "valueName": "avg"
    },
    {
      "cacheTimeout": null,
      "colorBackground": false,
      "colorValue": false,
      "colors": [
        "#299c46",
        "rgba(237, 129, 40, 0.89)",
        "#d44a3a"
      ],
      "datasource": "${DS_SYNAPSE_STATS}",
      "decimals": 0,
      "format": "none",
      "gauge": {
        "maxValue": 100,
        "minValue": 0,
        "show": false,
        "thresholdLabels": false,
        "thresholdMarkers": true
      },
      "gridPos": {
        "h": 3,
        "w": 5,
        "x": 0,
        "y": 41
      },
      "id": 29,
      "interval": null,
      "links": [],
      "mappingType": 1,
      "mappingTypes": [
        {
          "name": "value to text",
          "value": 1
        },
        {
          "name": "range to text",
          "value": 2
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      ],
      "maxDataPoints": 100,
      "nullPointMode": "connected",
      "nullText": null,
      "postfix": "",
      "postfixFontSize": "50%",
      "prefix": "",
      "prefixFontSize": "50%",
      "rangeMaps": [
        {
          "from": "null",
          "text": "N/A",
          "to": "null"
        }
      ],
      "sparkline": {
        "fillColor": "rgba(31, 118, 189, 0.18)",
        "full": false,
        "lineColor": "rgb(31, 120, 193)",
        "show": true
      },
      "tableColumn": "",
      "targets": [
        {
          "groupBy": [
            {
              "params": [
                "$__interval"
              ],
              "type": "time"
            },
            {
              "params": [
                "null"
              ],
              "type": "fill"
            }
          ],
          "measurement": "unbound",
          "orderByTime": "ASC",
          "policy": "autogen",
          "query": "SELECT last(\"msg_cache_count\") + last(\"rrset_cache_count\") FROM \"internal_1yr\".\"unbound\" WHERE (\"host\" = 'router.synapse.lan') AND $timeFilter GROUP BY time($__interval) fill(null)",
          "rawQuery": true,
          "refId": "A",
          "resultFormat": "time_series",
          "select": [
            [
              {
                "params": [
                  "mem_cache_rrset"
                ],
                "type": "field"
              },
              {
                "params": [],
                "type": "last"
              }
            ]
          ],
          "tags": [
            {
              "key": "host",
              "operator": "=",
              "value": "dns"
            }
          ]
        }
      ],
      "thresholds": "",
      "title": "DNS Memory Cache Items",
      "type": "singlestat",
      "valueFontSize": "80%",
      "valueMaps": [
        {
          "op": "=",
          "text": "N/A",
          "value": "null"
        }
      ],
      "valueName": "avg"
    }
  ],
  "refresh": "10s",
  "schemaVersion": 18,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": [
      {
        "auto": true,
        "auto_count": 10,
        "auto_min": "10s",
        "current": {
          "text": "1m",
          "value": "1m"
        },
        "hide": 0,
        "label": null,
        "name": "summarise",
        "options": [
          {
            "selected": false,
            "text": "auto",
            "value": "$__auto_interval_summarise"
          },
          {
            "selected": false,
            "text": "1s",
            "value": "1s"
          },
          {
            "selected": false,
            "text": "5s",
            "value": "5s"
          },
          {
            "selected": false,
            "text": "10s",
            "value": "10s"
          },
          {
            "selected": true,
            "text": "1m",
            "value": "1m"
          },
          {
            "selected": false,
            "text": "5m",
            "value": "5m"
          },
          {
            "selected": false,
            "text": "10m",
            "value": "10m"
          },
          {
            "selected": false,
            "text": "30m",
            "value": "30m"
          },
          {
            "selected": false,
            "text": "1h",
            "value": "1h"
          },
          {
            "selected": false,
            "text": "6h",
            "value": "6h"
          },
          {
            "selected": false,
            "text": "12h",
            "value": "12h"
          },
          {
            "selected": false,
            "text": "1d",
            "value": "1d"
          },
          {
            "selected": false,
            "text": "7d",
            "value": "7d"
          },
          {
            "selected": false,
            "text": "14d",
            "value": "14d"
          },
          {
            "selected": false,
            "text": "30d",
            "value": "30d"
          }
        ],
        "query": "1s,5s,10s,1m,5m,10m,30m,1h,6h,12h,1d,7d,14d,30d",
        "refresh": 2,
        "skipUrlSync": false,
        "type": "interval"
      }
    ]
  },
  "time": {
    "from": "now-1h",
    "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": "browser",
  "title": "pfSense System Stats",
  "uid": "MsFKtc1mk",
  "version": 42,
  "description": "Simple network and DNS stats of pfSense with dual-WAN setup."
}