[Enhancement request] Observability for ehcache3

[patpatpat123]

Hello team,

This is my first ticket here.
If not anything else, just wanted to say big thanks for this project.
I am using ehcache3 with SpringBoot, and it makes caching very easy.

Just wanted to reach out with a small enhancement request.
We are using this project in production, with some very critical business workloads.

We have observability on the web service layer, and observability for many components of our projects.
However, we find there is a lack of observability (metrics, tracing, JMX, etc.) for this project.

For instance, how much is the current cache size, and how much of non-miss cache (i.e. going to retrieve the data inside the cache directly) all those are hard to obtain, just to cite a few examples.

Would it be possible to enhancement this project with observability on the cache layer?
I think it would make this project even more production-ready, and improve customer experience.

Thank you for your time.