How to use the pydevd.get_global_debugger function in pydevd

pass
    else:
        exctype, value, traceback = call.excinfo._excinfo
        frames = []
        while traceback:
            frames.append(traceback.tb_frame)
            traceback = traceback.tb_next
        thread = threading.current_thread()
        frames_by_id = dict([(id(frame), frame) for frame in frames])
        frame = frames[-1]
        exception = (exctype, value, traceback)
        thread.additional_info.pydev_message = 'test fail'
        try:
            debugger = pydevd.debugger
        except AttributeError:
            debugger = pydevd.get_global_debugger()
        pydevd_tracing.SetTrace(None)  # no tracing from here
        try:
            debugger.stop_on_unhandled_exception(thread, frame, frames_by_id, exception)
        except AttributeError:
            # fallback to pre PyCharm 2019.2 API
            debugger.handle_post_mortem_stop(thread, frame, frames_by_id, exception)

    return report

else:
            from _pydev_bundle import pydev_log  # @Reimport
            pydev_log.debug('The threading module is already imported by user code.')

        if protocol:
            from _pydevd_bundle import pydevd_defaults
            pydevd_defaults.PydevdCustomization.DEFAULT_PROTOCOL = protocol

        import pydevd

        # I.e.: disconnect/reset if already connected.

        pydevd.SetupHolder.setup = None

        py_db = pydevd.get_global_debugger()
        if py_db is not None:
            py_db.dispose_and_kill_all_pydevd_threads(wait=False)

        # pydevd.DebugInfoHolder.DEBUG_RECORD_SOCKET_READS = True
        # pydevd.DebugInfoHolder.DEBUG_TRACE_BREAKPOINTS = 3
        # pydevd.DebugInfoHolder.DEBUG_TRACE_LEVEL = 3
        pydevd.settrace(
            port=port,
            host=host,
            stdoutToServer=True,
            stderrToServer=True,
            overwrite_prev_trace=True,
            suspend=False,
            trace_only_current_thread=False,
            patch_multiprocessing=False,
        )

else:
            from _pydev_bundle import pydev_log  # @Reimport
            pydev_log.debug('The threading module is already imported by user code.')

        if protocol:
            from _pydevd_bundle import pydevd_defaults
            pydevd_defaults.PydevdCustomization.DEFAULT_PROTOCOL = protocol

        import pydevd

        # I.e.: disconnect/reset if already connected.

        pydevd.SetupHolder.setup = None

        py_db = pydevd.get_global_debugger()
        if py_db is not None:
            py_db.dispose_and_kill_all_pydevd_threads(wait=False)

        # pydevd.DebugInfoHolder.DEBUG_RECORD_SOCKET_READS = True
        # pydevd.DebugInfoHolder.DEBUG_TRACE_BREAKPOINTS = 3
        # pydevd.DebugInfoHolder.DEBUG_TRACE_LEVEL = 3
        pydevd.settrace(
            port=port,
            host=host,
            stdoutToServer=True,
            stderrToServer=True,
            overwrite_prev_trace=True,
            suspend=False,
            trace_only_current_thread=False,
            patch_multiprocessing=False,
        )