API for outputting different formats from CPython sampling profiler

Feature or enhancement

Proposal:

CPython 3.15 has statistical sampling profiler which currently only supports outputting

1. pstats https://docs.python.org/3.15/library/profile.html#pstats.Stats
2. collapsed format for flamegraphs https://github.com/python/cpython/blob/8d5c3341c538cd1a4192ca8a1536b2eed4b98c69/Lib/profiling/sampling/stack_collector.py#L24

Since it's still an early stage for the sampling profiler, I thought it would be nice to initiate discussion around how to support multiple different formats from the profiler.

1. pprof
2. OTel

are the formats that could potentially be added, but supporting those from CPython would introduce dependencies that might complicate building/testing and distributing CPython.

I'd like to suggest that CPython has an interface to support 3rd party collectors. What do you think?

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/pre-pep-api-for-outputting-different-formats-from-cpython-sampling-profiler/103490

首先阅读 Lib/profiling/sampling/stack_collector.py，以及 issue 中引用的现有 pstats 和 collapsed-format 处理逻辑。在为第三方 collector 提出接口之前，请先查看链接的 Discourse 讨论；要视为完成，必须具备一致同意的 API、受支持格式的边界，以及针对 CPython 构建、测试和分发限制的计划。