GitHub user MindFlavor created an exporter for WireGuard that collects metrics from the wg show all dump command.

Install WireGuard Exporter

MindFlavor/prometheus_wireguard_exporter
A Prometheus exporter for WireGuard, written in Rust. - MindFlavor/prometheus_wireguard_exporter

You can either compile the exporter from source or use the cargo command to install the exporter. I opted for cargo.

apt-get update

apt-get install cargo

cargo install prometheus_wireguard_exporter

Cargo will download and install everything. Once this was done I copied the prometheus_wireguard_exporter executable to /usr/local/bin/. I'm not 100% positive if this is best practice, if you know a better way shoot me an email.

Once this is all done you should be able to run the exporter and it should show metrics on port 9586. curl http://localhost:9586/metrics

Create a service

[Unit]
Description=Prometheus WireGuard Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=root
Group=root
Type=simple
ExecStart=/usr/local/bin/prometheus_wireguard_exporter -n /etc/wireguard/your_config_file_here.conf

[Install]
WantedBy=multi-user.target
Service File Example from GitHub ReadMe

If you add the -n flag make sure you add the friendly name metadata to your peers.

[Peer]
# friendly_name = this is a friendly name
PublicKey = lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=
AllowedIPs = 10.70.0.40/32

Visualize

Grafana Dashboard

dashboard image
Example dashboard with sensitive data removed.
{
  "__inputs": [
    {
      "name": "DS_PROMETHEUS",
      "label": "Prometheus",
      "description": "",
      "type": "datasource",
      "pluginId": "prometheus",
      "pluginName": "Prometheus"
    }
  ],
  "__requires": [
    {
      "type": "grafana",
      "id": "grafana",
      "name": "Grafana",
      "version": "7.3.3"
    },
    {
      "type": "panel",
      "id": "graph",
      "name": "Graph",
      "version": ""
    },
    {
      "type": "datasource",
      "id": "prometheus",
      "name": "Prometheus",
      "version": "1.0.0"
    },
    {
      "type": "panel",
      "id": "stat",
      "name": "Stat",
      "version": ""
    },
    {
      "type": "panel",
      "id": "table",
      "name": "Table",
      "version": ""
    }
  ],
  "annotations": {
    "list": [
      {
        "builtIn": 1,
        "datasource": "-- Grafana --",
        "enable": true,
        "hide": true,
        "iconColor": "rgba(0, 211, 255, 1)",
        "name": "Annotations & Alerts",
        "type": "dashboard"
      }
    ]
  },
  "editable": true,
  "gnetId": null,
  "graphTooltip": 0,
  "id": null,
  "links": [],
  "panels": [
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROMETHEUS}",
      "fieldConfig": {
        "defaults": {
          "custom": {}
        },
        "overrides": []
      },
      "fill": 1,
      "fillGradient": 0,
      "gridPos": {
        "h": 9,
        "w": 24,
        "x": 0,
        "y": 0
      },
      "hiddenSeries": false,
      "id": 2,
      "legend": {
        "avg": false,
        "current": false,
        "max": false,
        "min": false,
        "show": true,
        "total": false,
        "values": false
      },
      "lines": true,
      "linewidth": 1,
      "nullPointMode": "null",
      "options": {
        "alertThreshold": true
      },
      "percentage": false,
      "pluginVersion": "7.3.3",
      "pointradius": 2,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "sum(idelta(wireguard_sent_bytes_total[20s])) by (interface)",
          "interval": "",
          "legendFormat": "{{interface}} OUT",
          "refId": "A"
        },
        {
          "expr": "- sum(idelta(wireguard_received_bytes_total[60s])) by (interface)",
          "interval": "",
          "legendFormat": "{{interface}} IN",
          "refId": "B"
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeRegions": [],
      "timeShift": null,
      "title": "Network Usage",
      "tooltip": {
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        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
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      },
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          "max": null,
          "min": null,
          "show": true
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          "format": "short",
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          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ],
      "yaxis": {
        "align": false,
        "alignLevel": null
      }
    },
    {
      "datasource": "${DS_PROMETHEUS}",
      "fieldConfig": {
        "defaults": {
          "custom": {},
          "mappings": [],
          "thresholds": {
            "mode": "absolute",
            "steps": [
              {
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          },
          "unit": "dateTimeFromNow"
        },
        "overrides": []
      },
      "gridPos": {
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        "w": 7,
        "x": 0,
        "y": 9
      },
      "id": 4,
      "options": {
        "colorMode": "value",
        "graphMode": "area",
        "justifyMode": "auto",
        "orientation": "auto",
        "reduceOptions": {
          "calcs": [
            "mean"
          ],
          "fields": "",
          "values": false
        },
        "textMode": "auto"
      },
      "pluginVersion": "7.3.3",
      "targets": [
        {
          "expr": "wireguard_latest_handshake_seconds * 1000",
          "instant": true,
          "interval": "",
          "legendFormat": "{{interface}}",
          "refId": "A"
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "Last Handshake",
      "type": "stat"
    },
    {
      "datasource": "${DS_PROMETHEUS}",
      "fieldConfig": {
        "defaults": {
          "custom": {
            "align": null,
            "filterable": false
          },
          "mappings": [],
          "thresholds": {
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            "steps": [
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                "color": "green",
                "value": null
              },
              {
                "color": "red",
                "value": 80
              }
            ]
          }
        },
        "overrides": [
          {
            "matcher": {
              "id": "byName",
              "options": "job"
            },
            "properties": [
              {
                "id": "custom.width",
                "value": 154
              }
            ]
          },
          {
            "matcher": {
              "id": "byName",
              "options": "public_key"
            },
            "properties": [
              {
                "id": "custom.width",
                "value": 414
              }
            ]
          },
          {
            "matcher": {
              "id": "byName",
              "options": "remote_port"
            },
            "properties": [
              {
                "id": "custom.width",
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          },
          {
            "matcher": {
              "id": "byName",
              "options": "remote_ip"
            },
            "properties": [
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            ]
          },
          {
            "matcher": {
              "id": "byName",
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            },
            "properties": [
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                "id": "unit",
                "value": "dateTimeFromNow"
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            ]
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        ]
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      "options": {
        "showHeader": true,
        "sortBy": []
      },
      "pluginVersion": "7.3.3",
      "targets": [
        {
          "expr": "wireguard_latest_handshake_seconds * 1000",
          "format": "table",
          "instant": true,
          "interval": "",
          "legendFormat": "",
          "refId": "A"
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "",
      "transformations": [
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          "id": "organize",
          "options": {
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              "Time": true,
              "__name__": true,
              "instance": true,
              "job": true
            },
            "indexByName": {},
            "renameByName": {
              "Value": "Last Check"
            }
          }
        }
      ],
      "type": "table"
    }
  ],
  "refresh": "30s",
  "schemaVersion": 26,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": []
  },
  "time": {
    "from": "now-1h",
    "to": "now"
  },
  "timepicker": {},
  "timezone": "",
  "title": "WireGuard",
  "uid": "-Ka00AIGz",
  "version": 5
}