No sys.monitoring RAISE event emitted when exception is re-raised (3.12b4)

[jpe]

It looks like no RAISE event is emitted for a bare raise in an except: clause or at the end of a finally: clause that implicitly reraises an exception. I don't know whether this a problem with the implementation or it should simply be documented that this is to be expected.

I mentioned this in #103082 but was encouraged to create a separate bug for it.

Linked PRs

• GH-106897: Add RERAISE event to sys.monitoring. #107291
• [3.12] GH-106897: Add RERAISE event to sys.monitoring. (GH-107291) #107346

[markshannon]

We should emit an event for these cases, as the "exception raised" events, and "exception handled" events should balance.
There are quite a lot of exception events during unwinding however, so this could be quite noisy.

For example:

def func():
    try:
        try:
            1/0
        except:
            raise
    except:
        pass

generates 3 raise/handled pairs. The obvious 2, plus another for cleanup, which is highly implementation dependent.
If we generate normal RAISE events it will break sys.settrace, so we need to emit a different event.
RERAISE is the obvious name.