Running neutron under wsgi should not register signals

[Arnaud Morin]

When running neutron behing apache mod_wsgi, neutron should not register any signal.

The signals are ignored by mod_wsgi but some traceback are printed in logs:

in plugins/ml2/ovo_rpc.py

signal.signal(signal.SIGINT, _ObjectChangeHandler.clean_up)
mod_wsgi (pid=10202): Callback registration for signal 15 ignored.

Also, when enabling Guru Meditation Reports, neutron is not able to take oslo_reports parameters into account.
See:
https://github.com/openstack/neutron/blob/master/neutron/cmd/__init__.py
https://github.com/openstack/oslo.reports/blob/master/oslo_reports/guru_meditation_report.py

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/884711

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/884842

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/884711
Committed: https://opendev.org/openstack/neutron/commit/878ea0dfd5e0af358b3d0bbd3a7888b55569d7cf
Submitter: "Zuul (22348)"
Branch: master

commit 878ea0dfd5e0af358b3d0bbd3a7888b55569d7cf
Author: Arnaud Morin <email address hidden>
Date: Tue May 30 16:48:32 2023 +0200

    Add a new option to enable signals

    When running behind a wsgi server like apache/mod_wsgi, neutron should
    not register on Signals, it will overlap with the Signals registered by
    the wsgi server.

    Related-Bug: #2021814

    Change-Id: I3c74846a8337d019f1ab6759ebb03f18c3f00238
    Signed-off-by: Arnaud Morin <email address hidden>

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/884842
Committed: https://opendev.org/openstack/neutron/commit/56821b6aea6be073352094ee32ae22fae5d6de01
Submitter: "Zuul (22348)"
Branch: master

commit 56821b6aea6be073352094ee32ae22fae5d6de01
Author: Arnaud Morin <email address hidden>
Date: Tue May 30 16:54:28 2023 +0200

    Register GMR with config

    As an operator, we want to set oslo_reports/file_event_handler because
    when running behind a wsgi server, GMR cannot register the Signal to be
    trigger.
    The parameter file_event_handler has been designed for this specific use
    case but it was not used correctly by neutron.

    Closes-Bug: #2021814

    Change-Id: Id13de1a3f9ea2eaaa7521eedf905aa0dd993ff89
    Signed-off-by: Arnaud Morin <email address hidden>

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 24.0.0.0b1 development milestone.