The agent keeps a reference to an instrumented function that prevents it from being garbage collected

https://github.com/pallets/flask

============================================================== FAILURES ==============================================================
__________________________________________________ test_app_freed_on_zero_refcount ___________________________________________________

    @require_cpython_gc
    def test_app_freed_on_zero_refcount():
        # A Flask instance should not create a reference cycle that prevents CPython
        # from freeing it when all external references to it are released (see #3761).
        gc.disable()
        try:
            app = flask.Flask(__name__)
            assert app.view_functions["static"]
            weak = weakref.ref(app)
            assert weak() is not None
            del app
>           assert weak() is None
E           AssertionError: assert <Flask 'test_basic'> is None
E            +  where <Flask 'test_basic'> = <weakref at 0x11b897b50; to 'Flask' at 0x11bcc5150>()

tests/test_basic.py:1888: AssertionError
--------------------------------------------------------- Captured log call ----------------------------------------------------------
INFO     _appmap.recording:recording.py:77 writing /Users/kgilpin/source/land-of-apps/pallets-flask/tmp/appmap/pytest/test_app_freed_on_zero_refcount.appmap.json
========================================================== warnings summary ==========================================================
venv/lib/python3.10/site-packages/_pytest/assertion/rewrite.py:274
  /Users/kgilpin/source/land-of-apps/pallets-flask/venv/lib/python3.10/site-packages/_pytest/assertion/rewrite.py:274: PytestAssertRewriteWarning: Module already imported so cannot be rewritten: _appmap
    self.config.issue_config_time_warning(

venv/lib/python3.10/site-packages/_pytest/assertion/rewrite.py:274
  /Users/kgilpin/source/land-of-apps/pallets-flask/venv/lib/python3.10/site-packages/_pytest/assertion/rewrite.py:274: PytestAssertRewriteWarning: Module already imported so cannot be rewritten: appmap
    self.config.issue_config_time_warning(

tests/test_basic.py::test_server_name_subdomain
  /Users/kgilpin/source/land-of-apps/pallets-flask/venv/lib/python3.10/site-packages/_appmap/instrument.py:92: UserWarning: Current server name 'foo.localhost' doesn't match configured server name 'dev.local'
    ret = f.fn(*args, **kwargs)

tests/test_basic.py::test_subdomain_matching_other_name[False]
tests/test_basic.py::test_subdomain_matching_other_name[True]
  /Users/kgilpin/source/land-of-apps/pallets-flask/venv/lib/python3.10/site-packages/_appmap/instrument.py:92: UserWarning: Current server name '127.0.0.1:3000' doesn't match configured server name 'localhost.localdomain:3000'
    ret = f.fn(*args, **kwargs)

tests/test_reqctx.py::test_proper_test_request_context
  /Users/kgilpin/source/land-of-apps/pallets-flask/venv/lib/python3.10/site-packages/_appmap/instrument.py:92: UserWarning: Current server name 'localhost' doesn't match configured server name 'localhost.localdomain:5000'
    ret = f.fn(*args, **kwargs)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
====================================================== short test summary info =======================================================
FAILED tests/test_basic.py::test_app_freed_on_zero_refcount - AssertionError: assert <Flask 'test_basic'> is None
================================== 1 failed, 469 passed, 7 skipped, 6 warnings in 85.70s (0:01:25) ===================================