chore(cos): include module and function on exit

[P403n1x87]

We use the result of a cached utility function to retrieve the function object referencing a given code object. This allows us to retrieve the module and the fully qualified function name for the frames on the stack of the exit span.

Checklist

• 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

• 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]

CODEOWNERS have been resolved as:

ddtrace/debugging/_function/discovery.py                                @DataDog/debugger-python
ddtrace/debugging/_origin/span.py                                       @DataDog/debugger-python
ddtrace/internal/utils/inspection.py                                    @DataDog/apm-core-python
tests/debugging/conftest.py                                             @DataDog/debugger-python
tests/debugging/test_debugger.py                                        @DataDog/debugger-python
tests/debugging/test_debugger_span_decoration.py                        @DataDog/debugger-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-21 11:24:15

Comparing candidate commit 503e775 in PR branch chore/cos-module-function-on-exit with baseline commit 0111544 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 394 metrics, 2 unstable metrics.

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: chore/cos-module-function-on-exit
Commit report: 503e775
Test service: dd-trace-py

✅ 0 Failed, 1598 Passed, 0 Skipped, 28m 49.27s Total duration (13m 10.41s time saved)