Good practice advice: Adding Prometheus to a JsonRpsee server

[Eikix]

Hi team,

At Kakarot, we're using JsonRpsee to build our Ethereum RPC layer. As our testnet is imminent, we're looking to add Prometheus to our RPC.

Do you recommend a preferred way to do it? We're currently reusing the code from Substrate that adds Prometheus to the JsonRpc server. I'm wondering if there is a way you'd recommend doing it, I suspect many people using jsonrpsee in prod had to ask themselves this question.

Happy to open a PR and add a example in the examples folder with the outcome of this discussion!

Thanks for your help (and cool software).

[niklasad1]

Hey @Eikix

Good question, I think the easiest way is to write them as RpcMiddleware as we have done in substrate but it's tricky to have connection stats without using the low-level server API.

Would be great if you could add an example for prometheus metrics or create a discussion thread at GitHub, thanks