neutron-rpc-server service ignores logging options in config files or arguments

[Takashi Kajinami]

While testing the deployment of neutron api by httpd + mod_wsgi[1], I noticed the log file for rpc-server service is not created even though the service is started with the proper arguments.

[1] https://review.opendev.org/c/openstack/puppet-openstack-integration/+/890924

example build:
https://zuul.opendev.org/t/openstack/build/4054295a0c6c444799516eb8ece7d757

The rpc-server.log file is not created

https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_405/890924/3/check/puppet-openstack-integration-7-scenario001-tempest-centos-9-stream/4054295/logs/neutron/index.html

According to ps, the rpc-server is started with --log-file

https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_405/890924/3/check/puppet-openstack-integration-7-scenario001-tempest-centos-9-stream/4054295/logs/ps.txt

```
neutron 76975 1 76975 0.2 0.3 124096 31732 /usr/bin/python3 /usr/bin/neutron-rpc-server --config-file /usr/share/neutron/neutron-dist.conf --config-dir /usr/share/neutron/server --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugin.ini --config-dir /etc/neutron/conf.d/common --config-dir /etc/neutron/conf.d/neutron-rpc-server --log-file /var/log/neutron/rpc-server.log
```

Digging into the code, I found out that setup_logging, which should be used to initialize logger based on config options as well as arguments, is not called in the code path for rcp-server.
It seems the method is not called for wsgi script which is used when api is run by WSGI mechanism such as uwsgi or mod_wsgi. Because of this I don't see the log file for api servcice is created, either.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/890937

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/890937
Committed: https://opendev.org/openstack/neutron/commit/afcce6d7493faaa2acf94c01268a2551a1300d31
Submitter: "Zuul (22348)"
Branch: master

commit afcce6d7493faaa2acf94c01268a2551a1300d31
Author: Takashi Kajinami <email address hidden>
Date: Thu Aug 10 03:54:25 2023 +0900

    Initialize logger for rpc-server and wsgi script

    Currently logger is not properly initialized according to config
    options or process arguments when the neutron-rpc-server script or
    the api wsgi script is used. Because of this neutron does not generate
    the log files as expected when we deploy api using WSGI and use
    neutron-rpc-server, instead of the monolithic neutron-server.

    This ensures the logger is initialized even when these two scripts
    are used.

    Closes-Bug: #2030904
    Related-Bug: #1693691
    Change-Id: I13bcd36c237555e0ca60d5ffc214b8f3bf6e478f

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 23.0.0.0b3 development milestone.