LaunchDarkly has added support for metrics and traces in its Relay Proxy (LD-relay) to provide better visibility into service metrics. Customers can now forward these metrics to standard monitoring tools like DataDog, StackDriver, and Prometheus. To use this feature, users need to create a configuration file specific to their chosen monitoring application and ensure that the settings in the monitoring tool are ready to consume data. The supported metrics include the number of requests received, open streaming connections, and route traces, which provide insights into the performance of the relay proxy.