Unleash / unleash / 10180583873

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chore: request origin prom metrics (#7709)

https://linear.app/unleash/issue/2-2501/adapt-origin-middleware-to-stop-logging-ui-requests-and-start

This adapts the new origin middleware to stop logging UI requests (too
noisy) and adds new Prometheus metrics.

<img width="745" alt="image"
src="https://github.com/user-attachments/assets/d0c7f51d-feb6-4ff5-b856-77661be3b5a9">

This should allow us to better analyze this data. If we see a lot of API
requests, we can dive into the logs for that instance and check the
logged data, like the user agent.

This PR adds some helper methods to make listening and emitting metric
events more strict in terms of types. I think it's a positive change
aligned with our scouting principle, but if you think it's complex and
does not belong here I'm happy with dropping it.

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