Invalid default value for `compute.virt-type` as `auto` that gives unnecessary traceback and errors intermittently

[nobuto-m]

In Sunbeam deployment, there are some trace back in the initial deployment process.

ERROR nova oslo_config.cfg.ConfigFileValueError: Value for option virt_type from LocationInfo(location=<Locations.user: (4, True)>, detail='/var/snap/openstack-hypervisor/common/etc/nova/nova.conf') is not valid: Valid values are [kvm, lxc, qemu, parallels], but found 'auto'

I think this invalid auto is coming from the snap's default value as:

snap-openstack-hypervisor/openstack_hypervisor/hooks.py

Line 348 in 08f8a3f

"compute.virt-type": "auto",

[journalctl -u snap.openstack-hypervisor.nova-api-metadata.service]

Apr 15 02:52:46 machine-1 systemd[1]: Started snap.openstack-hypervisor.nova-api-metadata.service - Service for snap application openstack-hypervisor.nova-api-metadata.
Apr 15 02:52:48 machine-1 openstack-hypervisor.nova-api-metadata[1109910]: 3 RLock(s) were not greened, to fix this error make sure you run eventlet.monkey_patch() before importing any other modules.
Apr 15 02:52:52 machine-1 nova-api-metadata[1109910]: 2026-04-15 02:52:52.948 1109910 WARNING nova.service [-] Running nova-metadata using eventlet is deprecated. Deploy with a WSGI server such as uwsgi or mod_wsgi.
Apr 15 02:52:53 machine-1 nova-api-metadata[1109910]: 2026-04-15 02:52:53.056 1109910 INFO nova.wsgi [-] metadata listening on 0.0.0.0:8775
Apr 15 02:52:53 machine-1 nova-api-metadata[1109910]: 2026-04-15 02:52:53.057 1109910 INFO oslo_service.service [-] Starting 4 workers
Apr 15 02:52:53 machine-1 nova-api-metadata[1111411]: 2026-04-15 02:52:53.078 1111411 ERROR oslo.messaging._drivers.impl_rabbit [None req-a04b829c-406f-42c5-8a04-ddb89c7469ec - - - - - -] Connection failed: [Errno 111] ECONNREFUSED (retrying in 1.0 seconds): ConnectionRefusedError: [Er
rno 111] ECONNREFUSED
Apr 15 02:52:53 machine-1 nova-api-metadata[1111412]: 2026-04-15 02:52:53.083 1111412 ERROR oslo.messaging._drivers.impl_rabbit [None req-92bc6d61-95a3-4e9b-aba1-fcdd2d7bc6d0 - - - - - -] Connection failed: [Errno 111] ECONNREFUSED (retrying in 1.0 seconds): ConnectionRefusedError: [Er
rno 111] ECONNREFUSED
Apr 15 02:52:53 machine-1 nova-api-metadata[1109910]: 2026-04-15 02:52:53.084 1109910 CRITICAL nova [-] Unhandled error: oslo_config.cfg.ConfigFileValueError: Value for option virt_type from LocationInfo(location=<Locations.user: (4, True)>, detail='/var/snap/openstack-hypervisor/common/etc/nova/nova.conf') is not valid: Valid values are [kvm, lxc, qemu, parallels], but found 'auto'
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova Traceback (most recent call last):
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2727, in _do_get
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     return (convert(val), alt_loc)
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova             ^^^^^^^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2696, in convert
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     return self._convert_value(
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova            ^^^^^^^^^^^^^^^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2824, in _convert_value
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     return opt.type(value)
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova            ^^^^^^^^^^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/types.py", line 167, in __call__
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     raise ValueError(
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova ValueError: Valid values are [kvm, lxc, qemu, parallels], but found 'auto'
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova 
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova During handling of the above exception, another exception occurred:
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova 
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova Traceback (most recent call last):
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/bin/nova-api-metadata", line 10, in <module>
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     sys.exit(main())
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova              ^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/nova/cmd/api_metadata.py", line 52, in main
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     service.wait()
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/nova/service.py", line 493, in wait
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     _launcher.wait()
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_service/service.py", line 654, in wait
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     self.conf.log_opt_values(LOG, logging.DEBUG)
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2622, in log_opt_values
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     _sanitize(opt, getattr(group_attr, opt_name)))
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 3172, in __getattr__
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     return self._conf._get(name, self._group)
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2664, in _get
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     value, loc = self._do_get(name, group, namespace)
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova   File "/snap/openstack-hypervisor/560/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2743, in _do_get
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova     raise ConfigFileValueError(message)
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova oslo_config.cfg.ConfigFileValueError: Value for option virt_type from LocationInfo(location=<Locations.user: (4, True)>, detail='/var/snap/openstack-hypervisor/common/etc/nova/nova.conf') is not valid: Valid values are [kvm, lxc, qemu, parallels], but found 'auto'
                                                      2026-04-15 02:52:53.084 1109910 ERROR nova 
Apr 15 02:52:53 machine-1 nova-api-metadata[1111414]: 2026-04-15 02:52:53.085 1111414 ERROR oslo.messaging._drivers.impl_rabbit [None req-169303ae-e50f-483a-9e7e-175045edfd1f - - - - - -] Connection failed: [Errno 111] ECONNREFUSED (retrying in 1.0 seconds): ConnectionRefusedError: [Errno 111] ECONNREFUSED
Apr 15 02:52:53 machine-1 nova-api-metadata[1111416]: 2026-04-15 02:52:53.091 1111416 ERROR oslo.messaging._drivers.impl_rabbit [None req-058a02a5-db34-4941-9d67-3837b4259be2 - - - - - -] Connection failed: [Errno 111] ECONNREFUSED (retrying in 1.0 seconds): ConnectionRefusedError: [Errno 111] ECONNREFUSED
Apr 15 02:52:53 machine-1 nova-api-metadata[1111414]: 2026-04-15 02:52:53.174 1111414 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
Apr 15 02:52:53 machine-1 nova-api-metadata[1111416]: 2026-04-15 02:52:53.175 1111416 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
Apr 15 02:52:53 machine-1 nova-api-metadata[1111414]: 2026-04-15 02:52:53.175 1111414 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111416]: 2026-04-15 02:52:53.175 1111416 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111412]: 2026-04-15 02:52:53.175 1111412 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
Apr 15 02:52:53 machine-1 nova-api-metadata[1111411]: 2026-04-15 02:52:53.175 1111411 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
Apr 15 02:52:53 machine-1 nova-api-metadata[1111412]: 2026-04-15 02:52:53.176 1111412 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111416]: 2026-04-15 02:52:53.176 1111416 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111411]: 2026-04-15 02:52:53.176 1111411 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111412]: 2026-04-15 02:52:53.176 1111412 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111414]: 2026-04-15 02:52:53.176 1111414 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 nova-api-metadata[1111411]: 2026-04-15 02:52:53.177 1111411 INFO nova.wsgi [-] Stopping WSGI server.
Apr 15 02:52:53 machine-1 systemd[1]: snap.openstack-hypervisor.nova-api-metadata.service: Main process exited, code=exited, status=1/FAILURE