does pants expose any performance / visualization tooling to help consumers know where time is being spent? bazel has this chrome profiler which is neat https://bazel.build/advanced/performance/json-trace-profile Even a simple “time by target type” would be helpful to me at the moment

There is https://www.pantsbuild.org/2.19/reference/subsystems/stats which will present some cache metrics.. don't think it presents data per target etc however..

yeah that mostly presents data around caching hits/read/writes I think

You can get some of this via https://www.pantsbuild.org/2.19/reference/subsystems/workunit-logger That's highly experimental and very under-documented, but I think it outputs a JSON file that could be transformed into formats for other tools to consume, like CTF that some tools consume (https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview) One could also write a plugin that does it "live". The source for that backend might be a good starting point https://github.com/pantsbuild/pants/blob/main/src/python/pants/backend/tools/workunit_logger/rules.py

oh very nice. How can I add my own bits of

metadata

from my plugin? I see

span_id

and

parent_id

which indicates its capturing the tree structure, conceptually similar to how open-telemetry works?

How can I add my own bits of

metadata

from my plugin?

I don't know; you might have to find someone who does (feel free to ask in #C01CQHVDMMW which is lower volume and so will be more likely for knowledgeable people to notice) or track it that back through the rest of the code.

I see

span_id

and

parent_id

which indicates its capturing the tree structure, conceptually similar to how open-telemetry works?

I believe so, yes

thanks 🙏 I think I found it. Theres a metadata method on some of the dataclasses https://github.com/pantsbuild/pants/blob/2e5c50511f809aa3c007bb54924277c3b0348f64/src/python/pants/core/goals/check.py#L63-L64 I’ll try adding some later