To Reproduce Steps to reproduce the behavior:

1. Deploy RHOSP/RHOSO with debug=true to nova.conf
2. Enable [keystone_authtoken]/memcache_use_advanced_pool=true in nova.conf
3. Restart all nova services

Expected behavior

• Configuration options under keystone_authtoken should be listed.

Bug impact

• Many users check the config outputs to distinguish whether the configuration is surely applied or not. By this issue, configuration options under keystone_authtoken section cannot be confirmed with this method.

Known workaround

• N/A

Additional context
By check other service, e.g. cinder, it generates the debug log to show the configuration.

cinder-scheduler.log:2025-09-22 05:06:59.534 2 DEBUG cinder.service [req-6515ad62-6c3b-417d-a8a3-b00b876c3b87 - - - - -] keystone_authtoken.memcache_use_advanced_pool = True log_opt_values /usr/lib/python3.9/site-packages/oslo_config/cfg.py:2613