See also https://storyboard.openstack.org/#!/story/2006714, this issue is seen in neutron-lbaas (v2) on Rocky UCA:
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server result = func(ctxt, **new_args)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/neutron_lbaas/drivers/common/agent_callbacks.py", line 214, in update_loadbalancer_stats
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server stats)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/neutron_lbaas/db/loadbalancer/loadbalancer_dbv2.py", line 864, in update_loadbalancer_stats
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server data=stats_data)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/neutron_lbaas/db/loadbalancer/loadbalancer_dbv2.py", line 176, in _create_loadbalancer_stats
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server total_connections=data.get(lb_const.STATS_TOTAL_CONNECTIONS, 0)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "<string>", line 4, in __init__
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/orm/state.py", line 417, in _initialize_instance
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server manager.dispatch.init_failure(self, args, kwargs)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server compat.reraise(exc_type, exc_value, exc_tb)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/util/compat.py", line 187, in reraise
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server raise value
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/orm/state.py", line 414, in _initialize_instance
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server return manager.original_init(*mixed[1:], **kwargs)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/ext/declarative/base.py", line 700, in _declarative_constructor
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server setattr(self, k, kwargs[k])
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/orm/attributes.py", line 229, in __set__
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server instance_dict(instance), value, None)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/orm/attributes.py", line 708, in set
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server value, old, initiator)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/orm/attributes.py", line 715, in fire_replace_event
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server state, value, previous, initiator or self._replace_token)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/sqlalchemy/orm/util.py", line 136, in set_
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server return validator(state.obj(), key, value)
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/neutron_lbaas/db/loadbalancer/models.py", line 65, in validate_non_negative_int
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server if value < 0:
2019-10-14 08:02:16.802 18834 ERROR oslo_messaging.rpc.server TypeError: '<' not supported between instances of 'str' and 'int'
python3-neutron-lbaas 2:13.0.0-0ubuntu1~cloud0
This is fixed in neutron-lbaas 13.0.1 and 14.0.1 for Rocky and Stein, respectively, needs new pkgs.