How to produce this ignored exception:

import elasticapm

elasticapm.Client({})

Then got output:

No custom SERVICE_NAME was set -- using non-descript default 'unknown-python-service'
Could not register elasticapm.metrics.sets.cpu.CPUMetricSet metricset: psutil not found. Install it to get system and process metrics
Exception ignored in: <gzip on 0x10443e590>
Traceback (most recent call last):
  File "/Users/maksych/.local/share/uv/python/cpython-3.13.0-macos-aarch64-none/lib/python3.13/gzip.py", line 378, in close
    fileobj.write(self.compress.flush())
ValueError: I/O operation on closed file.

Following up, is there any workaround on this one? I see a draft PR with 3.13 support though

when is it fixed?

to suppress the message from polluting the logs in your project, this can be done

import sys

def suppressor(unraisable):  # type: ignore
    if unraisable.exc_type is ValueError and "I/O operation on closed file" in str(unraisable.exc_value):
        pass
    else:
        sys.__unraisablehook__(unraisable)


sys.unraisablehook = suppressor

Yesterday I merged the PR fixing a couple of warnings in main, still in order to have other warnings fixed we are waiting for a Python 3.13 patch release including python/cpython#129726 . If anyone would like to give current main a try it would be much appreciated.

Thanks @xrmx !! Just saw the issue in CPython; that one was nasty! 🚀