Pytheus – Python Prometheus client built with multiprocessing in mind
Sharing this side project of mine, if you had issues while using multiprocess in python when collecting metrics this might interest you :) The library offers the same interface between single process & multi process, the only difference is doing a function call specifying which backend to use and everything will work out of the box. It supports default labels & partial labels so that you can build your child instances incrementally. It strives to be flexible & well documented. There is also an experimental backend for it written in Rust as a way to support asyncio applications, more in the…
In plain words
Pytheus is a Python Prometheus client library designed for multiprocessing environments. It provides a unified interface for collecting metrics across single and multiprocess applications, requiring only a function call to specify the backend. The library supports default and partial labels for building child instances incrementally, and includes an experimental Rust-based backend for asyncio applications. It emphasizes flexibility and comprehensive documentation.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Sharing this side project of mine, if you had issues while using multiprocess in python when collecting metrics this might interest you :) The library offers the same interface between single process & multi process, the only difference is doing a function call specifying which backend to use and everything will work out of the box. It supports default labels & partial labels so that you can build your child instances incrementally. It strives to be flexible & well documented. There is also an experimental backend for it written in Rust as a way to support asyncio applications, more in the docs!
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