I have recently iterated through several more versions. At this stage, compared to other openmetrics/prometheus libraries in the Rust ecosystem, I believe this one is already competitive in terms of both ease of use and performance.
I recently developed an openmetrics client library
github.com/koushiro/fastmetr…, inspired by the API designs of some existing libraries. I’ve been using it in production for a while. If anyone tries it out and shares feedback, I’d be very grateful.