diff --git a/docs/index.md b/docs/index.md
index 51418a6..2bee6aa 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -3,3 +3,7 @@
 ## API
 
 * [Standalone signaling API](standalone-signaling-api-v1.md)
+
+## Other
+
+* [Prometheus Metrics](prometheus-metrics.md)
diff --git a/docs/prometheus-metrics.md b/docs/prometheus-metrics.md
new file mode 100644
index 0000000..942ac77
--- /dev/null
+++ b/docs/prometheus-metrics.md
@@ -0,0 +1,47 @@
+# Prometheus metrics
+
+The signaling server and -proxy expose various metrics that can be queried by a
+[Prometheus](https://prometheus.io/) server from the `/metrics` endpoint.
+
+Only clients connecting from an IP that is included in the `allowed_ips` value
+of the `[stats]` entry in the configuration file are allowed to query the
+metrics.
+
+
+## Available metrics
+
+The following metrics are available:
+
+| Metric                                            | Type      | Since     | Description                                                               | Labels                            |
+| :------------------------------------------------ | :-------- | --------: | :------------------------------------------------------------------------ | :-------------------------------- |
+| `signaling_proxy_sessions`                        | Gauge     | 0.4.0     | The current number of sessions                                            |                                   |
+| `signaling_proxy_sessions_total`                  | Counter   | 0.4.0     | The total number of created sessions                                      |                                   |
+| `signaling_proxy_sessions_resumed_total`          | Counter   | 0.4.0     | The total number of resumed sessions                                      |                                   |
+| `signaling_proxy_publishers`                      | Gauge     | 0.4.0     | The current number of publishers                                          | `type`                            |
+| `signaling_proxy_publishers_total`                | Counter   | 0.4.0     | The total number of created publishers                                    | `type`                            |
+| `signaling_proxy_subscribers`                     | Gauge     | 0.4.0     | The current number of subscribers                                         | `type`                            |
+| `signaling_proxy_subscribers_total`               | Counter   | 0.4.0     | The total number of created subscribers                                   | `type`                            |
+| `signaling_proxy_command_messages_total`          | Counter   | 0.4.0     | The total number of command messages                                      | `type`                            |
+| `signaling_proxy_payload_messages_total`          | Counter   | 0.4.0     | The total number of payload messages                                      | `type`                            |
+| `signaling_proxy_token_errors_total`              | Counter   | 0.4.0     | The total number of token errors                                          | `reason`                          |
+| `signaling_backend_session_limit_exceeded_total`  | Counter   | 0.4.0     | The number of times the session limit exceeded                            | `backend`                         |
+| `signaling_backend_current`                       | Gauge     | 0.4.0     | The current number of configured backends                                 |                                   |
+| `signaling_client_countries_total`                | Counter   | 0.4.0     | The total number of connections by country                                | `country`                         |
+| `signaling_hub_rooms`                             | Gauge     | 0.4.0     | The current number of rooms per backend                                   | `backend`                         |
+| `signaling_hub_sessions`                          | Gauge     | 0.4.0     | The current number of sessions per backend                                | `backend`, `clienttype`           |
+| `signaling_hub_sessions_total`                    | Counter   | 0.4.0     | The total number of sessions per backend                                  | `backend`, `clienttype`           |
+| `signaling_hub_sessions_resume_total`             | Counter   | 0.4.0     | The total number of resumed sessions per backend                          | `backend`, `clienttype`           |
+| `signaling_hub_sessions_resume_failed_total`      | Counter   | 0.4.0     | The total number of failed session resume requests                        |                                   |
+| `signaling_mcu_publishers`                        | Gauge     | 0.4.0     | The current number of publishers                                          | `type`                            |
+| `signaling_mcu_publishers_total`                  | Counter   | 0.4.0     | The total number of created publishers                                    | `type`                            |
+| `signaling_mcu_subscribers`                       | Gauge     | 0.4.0     | The current number of subscribers                                         | `type`                            |
+| `signaling_mcu_subscribers_total`                 | Counter   | 0.4.0     | The total number of created subscribers                                   | `type`                            |
+| `signaling_mcu_nopublisher_total`                 | Counter   | 0.4.0     | The total number of subscribe requests where no publisher exists          | `type`                            |
+| `signaling_mcu_messages_total`                    | Counter   | 0.4.0     | The total number of MCU messages                                          | `type`                            |
+| `signaling_mcu_publisher_streams`                 | Gauge     | 0.4.0     | The current number of published media streams                             | `type`                            |
+| `signaling_mcu_subscriber_streams`                | Gauge     | 0.4.0     | The current number of subscribed media streams                            | `type`                            |
+| `signaling_mcu_backend_connections`               | Gauge     | 0.4.0     | Current number of connections to signaling proxy backends                 | `country`                         |
+| `signaling_mcu_backend_load`                      | Gauge     | 0.4.0     | Current load of signaling proxy backends                                  | `url`                             |
+| `signaling_mcu_no_backend_available_total`        | Counter   | 0.4.0     | Total number of publishing requests where no backend was available        | `type`                            |
+| `signaling_room_sessions`                         | Gauge     | 0.4.0     | The current number of sessions in a room                                  | `backend`, `room`, `clienttype`   |
+| `signaling_server_messages_total`                 | Counter   | 0.4.0     | The total number of signaling messages                                    | `type`                            |
diff --git a/mkdocs.yml b/mkdocs.yml
index 19bab73..4134c10 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -20,3 +20,4 @@ markdown_extensions:
 nav:
   - 'API documentation':
       - 'Standalone signaling API': 'standalone-signaling-api-v1.md'
+  - 'Prometheus Metrics': 'prometheus-metrics.md'