freifunkMUC · GoliathLabs · Dec 18, 2025 · Jan 8, 2026
@@ -124,6 +124,19 @@ See the [Releases section](https://github.com/freifunkMUC/wg-access-server/relea
 
 ## Development
 
+### Metrics (Prometheus)
+
+- Endpoint: `/metrics` on the HTTP/HTTPS server.
+- Exposed metrics include:
+  - `wg_access_server_build_info{version,commit}`: build metadata (value 1)
+  - `wg_access_server_up`: 1 if storage and WireGuard are reachable
+  - `wg_access_server_devices_total`: total devices in storage
+  - `wg_access_server_devices_connected`: devices with a recent handshake
+  - `wg_access_server_devices_bytes_received_total`: sum of received bytes across devices
+  - `wg_access_server_devices_bytes_transmitted_total`: sum of transmitted bytes across devices
+
+If `EnableMetadata` is enabled, device-specific metrics are included in the output.
+
 The software consists of a Golang server and a React app.
 
 If you want to make changes to the project locally, you can do so relatively easily with the following steps.

@@ -44,7 +44,7 @@ func Register(app *kingpin.Application) *servecmd {
 	cli.Flag("port", "The port that the web ui server will listen on").Envar("WG_PORT").Default("8000").IntVar(&cmd.AppConfig.Port)
 	cli.Flag("external-host", "The external origin of the server (e.g. https://mydomain.com)").Envar("WG_EXTERNAL_HOST").StringVar(&cmd.AppConfig.ExternalHost)
 	cli.Flag("storage", "The storage backend connection string").Envar("WG_STORAGE").Default("memory://").StringVar(&cmd.AppConfig.Storage)
-	cli.Flag("disable-metadata", "Disable metadata collection (i.e. metrics)").Envar("WG_DISABLE_METADATA").Default("false").BoolVar(&cmd.AppConfig.DisableMetadata)
+	cli.Flag("enable-metadata", "Enable metadata collection (i.e. metrics)").Envar("WG_ENABLE_METADATA").Default("false").BoolVar(&cmd.AppConfig.EnableMetadata)
 	cli.Flag("enable-inactive-device-deletion", "Enable inactive device deletion").Envar("WG_ENABLE_INACTIVE_DEVICE_DELETION").Default("false").BoolVar(&cmd.AppConfig.EnableInactiveDeviceDeletion)
 	cli.Flag("inactive-device-grace-period", "Duration after inactive device are deleted").Envar("WG_INACTIVE_DEVICE_GRACE_PERIOD").Default((1 * config.Year).String()).DurationVar(&cmd.AppConfig.InactiveDeviceGracePeriod)
 	cli.Flag("filename", "The configuration filename (e.g. WireGuard-Home)").Envar("WG_FILENAME").StringVar(&cmd.AppConfig.Filename)
@@ -236,7 +236,7 @@ func (cmd *servecmd) Run() {
 	}
 
 	// Services
-	if err := deviceManager.StartSync(conf.DisableMetadata, conf.EnableInactiveDeviceDeletion, conf.InactiveDeviceGracePeriod); err != nil {
+	if err := deviceManager.StartSync(conf.EnableMetadata, conf.EnableInactiveDeviceDeletion, conf.InactiveDeviceGracePeriod); err != nil {
 		logrus.Error(errors.Wrap(err, "failed to sync"))
 		return
 	}
@@ -248,6 +248,12 @@ func (cmd *servecmd) Run() {
 	// Health check endpoint
 	router.PathPrefix("/health").Handler(services.HealthEndpoint(deviceManager))
 
+	// Prometheus metrics endpoint (public, no auth)
+	router.Path("/metrics").Handler(services.MetricsHandler(&services.MetricsDeps{
+		Config:        conf,
+		DeviceManager: deviceManager,
+	}))
+
 	// Authentication middleware
 	middleware, err := authnz.NewMiddleware(conf.Auth, authnz.ClaimsMiddleware(conf))
 	if err != nil {
@@ -366,7 +372,7 @@ func (cmd *servecmd) ReadConfig() *config.AppConfig {
 		}
 	}
 
-	if cmd.AppConfig.DisableMetadata {
+	if !cmd.AppConfig.EnableMetadata {
 		logrus.Info("Metadata collection has been disabled. No metrics or device connectivity information will be recorded or shown")
 	}
 

@@ -38,7 +38,7 @@ Here's what you can configure:
 | `WG_HTTP_HOST`                       | `--http-host`                       | `httpHost`                     |          | `` (all hosts)                               | Hostname or IP address to bind the HTTP server to. If left empty, the HTTP server will listen on all IP addresses on all available network interfaces.                                                                                                                                |
 | `WG_EXTERNAL_HOST`                   | `--external-host`                   | `externalHost`                 |          |                                              | The external domain for the server (e.g. www.mydomain.com)                                                                                                                                                                                                                    |
 | `WG_STORAGE`                         | `--storage`                         | `storage`                      |          | `sqlite3:///data/db.sqlite3`                 | A storage backend connection string. See [storage docs](./3-storage.md)                                                                                                                                                                                                       |
-| `WG_DISABLE_METADATA`                | `--disable-metadata`                | `disableMetadata`              |          | `false`                                      | Turn off collection of device metadata logging. Includes last handshake time and RX/TX bytes only.                                                                                                                                                                            |
+| `WG_ENABLE_METADATA`                 | `--enable-metadata`                 | `enableMetadata`               |          | `false`                                      | Turn on collection of device metadata logging. Includes last handshake time and RX/TX bytes only.                                                                                                                                                                             |
 | `WG_ENABLE_INACTIVE_DEVICE_DELETION` | `--enable-inactive-device-deletion` | `enableInactiveDeviceDeletion` |          | `false`                                      | Enable/Disable the automatic deletion of inactive devices.                                                                                                                                                                                                                    |
 | `WG_INACTIVE_DEVICE_GRACE_PERIOD`    | `--inactive-device-grace-period`    | `inactiveDeviceGracePeriod`    |          | `8760h` (1 Year)                             | The duration after which inactive devices are automatically deleted, if automatic deletion is enabled. A device is inactive if it has not been connected to the server for longer than the inactive device grace period. The duration format is the go duration string format |
 | `WG_FILENAME        `                | `--filename`                        | `filename`                     |          | `WireGuard`                                  | Change the name of the configuration file the user can download (Do not include the '.conf' extension )                                                                                                                                                                       |

@@ -20,6 +20,7 @@ require (
 	github.com/miekg/dns v1.1.68
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/pkg/errors v0.9.1
+	github.com/prometheus/client_golang v1.20.5
 	github.com/sirupsen/logrus v1.9.3
 	github.com/stretchr/testify v1.11.1
 	github.com/tg123/go-htpasswd v1.2.4
@@ -37,7 +38,9 @@ require (
 	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/GehirnInc/crypt v0.0.0-20230320061759-8cc1b52080c5 // indirect
 	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/containerd/errdefs v1.0.0 // indirect
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
@@ -49,16 +52,21 @@ require (
 	github.com/gorilla/securecookie v1.1.2 // indirect
 	github.com/ishidawataru/sctp v0.0.0-20250708014235-1989182a9425 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
-	github.com/kr/pretty v0.3.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/lib/pq v1.10.9 // indirect
 	github.com/mattn/go-sqlite3 v1.14.28 // indirect
 	github.com/mdlayher/genetlink v1.3.2 // indirect
 	github.com/mdlayher/netlink v1.8.0 // indirect
 	github.com/mdlayher/socket v0.5.1 // indirect
 	github.com/moby/sys/atomicwriter v0.1.0 // indirect
 	github.com/moby/sys/sequential v0.6.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/rs/cors v1.11.1 // indirect
 	github.com/vishvananda/netns v0.0.5 // indirect
 	github.com/xhit/go-str2duration/v2 v2.1.0 // indirect

@@ -35,6 +35,7 @@ github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZw
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
@@ -44,6 +45,8 @@ github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK3
 github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/clbanning/x2j v0.0.0-20191024224557-825249438eec/go.mod h1:jMjuTZXRI4dUb/I5gc9Hdhagfvm9+RyrPryS/auMzxE=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
@@ -237,16 +240,20 @@ github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/klauspost/compress v1.10.3/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
 github.com/klauspost/compress v1.11.7/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
+github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
+github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
-github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
-github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/leodido/go-urn v1.2.0/go.mod h1:+8+nEpDfqqsY+g338gtMEUOtuK+4dEMhiQEgxpxOKII=
 github.com/lib/pq v1.1.1/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
@@ -289,6 +296,8 @@ github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJ
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f h1:KUppIJq7/+SVif2QVs3tOP0zanoHgBEVAwHxUSIzRqU=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
@@ -338,28 +347,36 @@ github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_golang v1.3.0/go.mod h1:hJaj2vgQTGQmVCsAACORcieXFeDPbaTKGT+JTgUa3og=
 github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
+github.com/prometheus/client_golang v1.20.5 h1:cxppBPuYhUnsO6yo/aoRol4L7q7UFfdm+bR9r+8l63Y=
+github.com/prometheus/client_golang v1.20.5/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.1.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
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-github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
-github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
+github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
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 github.com/rs/cors v1.11.1/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
@@ -635,8 +652,9 @@ gopkg.in/Knetic/govaluate.v2 v2.3.0/go.mod h1:NW0gr10J8s7aNghEg6uhdxiEaBvc0+8VgJ
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=

@@ -36,9 +36,9 @@ type AppConfig struct {
 	// Supports memory:// postgresql:// mysql:// sqlite3://
 	// Defaults to memory://
 	Storage string `yaml:"storage"`
-	// DisableMetadata allows you to turn off collection of device
+	// EnableMetadata allows you to turn on collection of device
 	// metadata including last handshake time & rx/tx bytes
-	DisableMetadata bool `yaml:"disableMetadata"`
+	EnableMetadata bool `yaml:"enableMetadata"`
 	// EnableInactiveDeviceDeletion allows you to delete inactive devices
 	// automatically after a time duration defined by InactiveDeviceGracePeriod
 	EnableInactiveDeviceDeletion bool `yaml:"enableInactiveDeviceDeletion"`