logs/undercloud/var/log/extra/errors.txt shows:

2021-11-14 05:26:11.097 ERROR /var/log/containers/nova/nova-api.log: 11 ERROR oslo.messaging._drivers.impl_rabbit [-] [03e67fe0-daf8-4ac3-8bda-beae53b27e78] AMQP server on standalone.ctlplane.localdomain:5672 is unreachable: [Errno 104] Connection reset by peer. Trying again in 1 seconds.: ConnectionResetError: [Errno 104] Connection reset by peer
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova Traceback (most recent call last):
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/bin/nova-conductor", line 10, in <module>
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     sys.exit(main())
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/cmd/conductor.py", line 46, in main
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     topic=rpcapi.RPC_TOPIC)
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/service.py", line 256, in create
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     periodic_interval_max=periodic_interval_max)
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/service.py", line 116, in __init__
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     self.manager = manager_class(host=self.host, *args, **kwargs)
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/conductor/manager.py", line 119, in __init__
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     self.compute_task_mgr = ComputeTaskManager()
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/conductor/manager.py", line 244, in __init__
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     self.report_client = report.SchedulerReportClient()
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/scheduler/client/report.py", line 188, in __init__
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     self._client = self._create_client()
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/scheduler/client/report.py", line 231, in _create_client
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     client = self._adapter or utils.get_sdk_adapter('placement')
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/utils.py", line 984, in get_sdk_adapter
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     return getattr(conn, service_type)
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/openstack/service_description.py", line 87, in __get__
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     proxy = self._make_proxy(instance)
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova   File "/usr/lib/python3.6/site-packages/openstack/service_description.py", line 271, in _make_proxy
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova     region_name=region_name))
2021-11-14 04:48:11.612 ERROR /var/log/containers/nova/nova-conductor.log: 7 ERROR nova openstack.exceptions.NotSupported: The placement service for 192.168.24.3:regionOne exists but does not have any supported versions.