To Reproduce Steps to reproduce the behavior:

1. Configure Aodh with application credestials
2. Create an autoscaling stack
3. See aodh-notifier logs with this traceback

4. 2026-01-16 14:44:59.332 15 ERROR aodh.notifier Traceback (most recent call last):
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/aodh/notifier/__init__.py", line 136, in _handle_action
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     notifier.notify(action, alarm_id, alarm_name, severity,
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/aodh/notifier/trust.py", line 35, in notify
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     client = keystone_client.get_trusted_client(self.conf, trust_id)
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/aodh/keystone_client.py", line 48, in get_trusted_client
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     password=conf[CFG_GROUP].password,
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier              ^^^^^^^^^^^^^^^^^^^^^^^^
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/oslo_config/cfg.py", line 3377, in __getattr__
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     return self._conf._get(name, self._group)
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/oslo_config/cfg.py", line 2868, in _get
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     value, loc = self._do_get(name, group, namespace)
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/oslo_config/cfg.py", line 2886, in _do_get
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     info = self._get_opt_info(name, group)
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   File "/usr/lib/python3.12/site-packages/oslo_config/cfg.py", line 3091, in _get_opt_info
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier     raise NoSuchOptError(opt_name, group)
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier oslo_config.cfg.NoSuchOptError: no such option password in group [service_credentials]
   2026-01-16 14:44:59.332 15 ERROR aodh.notifier   

Expected behavior

• Aodh-notifier works

Bug impact

• Aodh won't work with application credentials enabled. But password authentication will still work

Known workaround

• Disable application credentials for aodh / autoscaling (password will automatically get used instead, which works)