fix: wrapping context __exit__ leak [backport 2.21]

[github-actions[bot]]

Backport e7c0d746efa3f8cc39a72d803e3d8c13a54c906f from #13626 to 2.21.

We fix a leak in the universal wrapping context caused to bound exit method leaking in CPython 3.9 and 3.10. This was due to a reference to the bound method exit of the universal wrapping context not getting popped from the stack before every return statement. Every call to a wrapped function would then create one such bounded method object that would not get GC'd. No other versions of CPython are affected because the bytecode and/or approach are different.

Checklist

• [x] PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• [x] Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions[bot]]

CODEOWNERS have been resolved as:

releasenotes/notes/fix-wrapping-context-memory-leak-ad3d8f27586ba662.yaml  @DataDog/apm-python
ddtrace/internal/wrapping/context.py                                    @DataDog/apm-core-python
tests/internal/test_wrapping.py                                         @DataDog/debugger-python @DataDog/apm-core-python

[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2025-06-18 11:00:35

Comparing candidate commit db0db1a2cd093b10c2ed3174c30973359603fb5e in PR branch backport-13626-to-2.21 with baseline commit 89e8597a02cb00bb1b11e0036817dd5a1fdc4662 in branch 2.21.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 328 metrics, 2 unstable metrics.

[github-actions[bot]]

This pull request has been automatically closed after a period of inactivity. After this much time, it will likely be easier to open a new pull request with the same changes than to update this one from the base branch. Please comment or reopen if you think this pull request was closed in error.