How can I change how paths are labelled? about client_ruby

[Sinjo]

Hi @rquinlivan 👋🏻

The collector middleware we provide in Prometheus::Middleware::Collector is intended to cater to basic HTTP metric collection needs and doesn't allow customising path filtering or metric labels.

Back when we were preparing for our 1.0 release, we did consider adding some extra options to initialize, to allow customising labels and path handling by passing lambdas to it which would override our default implementations. We quickly realised that once we did that, there was essentially nothing left of our middleware code and it was just invoking lambdas. At that point, we didn't feel that there was any value in using our middleware and it would be better for users of client_ruby to create their own collector middleware in their application's codebase (possibly copying ours as a base).

If you're interested, the original discussion is over at #111 and references the implementation that we scrapped.

Hope that's helpful!