message: Add a note about metrics
diff: @@ -79,6 +79,10 @@ docker build -t halfshot/matrix-appservice-discord .
  # Run the container
  docker run -v /matrix-appservice-discord:/data -p 9005:9005 halfshot/matrix-appservice-discord
  ```
  +#### Metrics
  +
  +The bridge supports reporting metrics via Prometheus. You can configure metrics support in the config
  +file. The metrics will be reported under the URL provided in the registration file, on the `/metrics` endpoint.
  #### 3PID Protocol Support
  