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It's helpful if you're, for example, running unit or integration tests and see stuck threads.

Often you can find a misbehaving process that somehow got into a weird state, one that you weren't tracing beforehand because you weren't expecting trouble and didn't want the overhead, and in those cases it can be tremendously useful to be able to attach some inspection tool to figure out what's going on so you can fix the underlying bug.

I only read the first paragraph but it sounds like it addresses this?

> It gives you a live, easy-to-navigate view into the program's tasks and resources, summarizing both their current status and their historical behavior.

Dumping to a file for later analysis is on the roadmap.