Feature Request: Integrated Prometheus Metrics Exporter

[kouvaliasnick]

Is your feature request related to a problem? Please describe.
We're migrating from coturn to turn-rs for its superior performance, but we're missing the ability to monitor server health and performance metrics. Currently, there's no built-in way to expose metrics to Prometheus, which makes it difficult to:

• Monitor server health
• Track resource usage
• Debug performance issues
• Set up alerts for potential problems

Describe the solution you'd like
An integrated Prometheus metrics exporter similar to what coturn provides. Key metrics we'd like to see:

• Total/active allocations
• Bytes sent/received
• Packets sent/received
• Protocol-specific metrics (UDP/TCP/TLS)
• Session duration
• Error counts

Ideally exposed on a /metrics endpoint in standard Prometheus format.

Describe alternatives you've considered

• Using system-level metrics only (less accurate/useful)

Additional context
We're using turn-rs in a production environment where monitoring is crucial for maintaining service reliability.

[mycrl]

The existing http api can provide this information you want, so you can expose it to Prometheus yourself.
However, your feature request is not unnecessary, so I will add support for exporting to Prometheus.