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Noemi 6f3aead436 Unwrap Celery's ExceptionInfo (#1863)
* Unwrap `ExceptionInfo` and `ExceptionWithTraceback`

Instead of reporting the `ExceptionInfo` and `ExceptionWithTraceback`
wrappers raised by Celery, report the exceptions that they wrap.

This ensures that the exception in the OpenTelemetry span has a type
and traceback that are meaningful and relevant to the developer.

* Fix typo

The exception is expected, not excepted. Well, I guess it is also
excepted, because it's an exception, but you get what I mean.

* Reformat file with `black`

Reformat the `__init__.py` file in the Celery instrumentation using
`black`, fixing a CI linter error.

* Address review feedback

Use the VERSION attribute exposed by Billiard to decide whether to
import ExceptionWithTraceback.

Add a test for a failing task and check that the exceptions' type
and message are preserved.

* Amend ExceptionWithTraceback import
2023-09-03 13:56:33 +03:00
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