Add WebSocket Proxy Prometheus Metrics Endpoint

[michaeljmarshall]

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• I searched in the issues and found nothing similar.

Motivation

Metrics are essential to all production deployments.

Solution

Expose a metrics endpoint. This will require formatting the metrics, and then exposing them. Typically, these metrics are exposed at the /metrics endpoint.

Alternatives

There is currently and endpoint for /admin/v2/proxy-stats/metrics, but that exposes metrics in a JSON format. It looks like the logic for those metrics could easily be converted into correct Prometheus metrics.

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!

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