[issue44075] Add a PEP578 audit hook for Asyncio loop stalls

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

I am still not convinced that audit events should be used.

Maybe support of explicit callbacks pair (on_start() + on_finish()) with `None` for fast-and-cheap "do nothing flag" is a better alternative for catching stale coroutines?

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<https://bugs.python.org/issue44075>
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