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Add BRANCH_TAKEN and BRANCH_NOT_TAKEN events to sys.monitoring #122548

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@markshannon

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@markshannon
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Feature or enhancement

Proposal:

Proposal:

  • Add BRANCH_TAKEN and BRANCH_NOT_TAKEN events to sys.monitoring
  • Deprecate the old BRANCH event (as it will be redundant)
  • Monitoring BRANCH events implicitly monitors both the BRANCH_TAKEN and BRANCH_NOT_TAKEN events
  • Disabling a BRANCH_TAKEN event will implicitly disable the matching BRANCH event, but only for the taken branch
  • Disabling a BRANCH_NOT_TAKEN event will implicitly disable the matching BRANCH event, but only for the not-taken branch
  • Disabling a BRANCH event will implicitly disable the both the matching BRANCH_TAKEN and BRANCH_NOT_TAKEN events

This is fully backwards compatible.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

Discussion which also links to prior discussions.

Linked PRs

### Tasks
- [ ] https://github.com/python/cpython/issues/123044
- [ ] https://github.com/python/cpython/issues/123048
- [ ] https://github.com/python/cpython/issues/123050
- [ ] https://github.com/python/cpython/issues/128375
- [ ] https://github.com/python/cpython/issues/128533
- [ ] https://github.com/python/cpython/issues/128534

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    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-featureA feature request or enhancementA feature request or enhancement

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