$ nova-status upgrade check 
JSON formatted policy_file support is deprecated since Victoria release. You need to use YAML format which will be default in future. You can use ``oslopolicy-convert-json-to-yaml`` tool to convert existing JSON-formatted policy file to YAML-formatted in backward compatible way: https://docs.openstack.org/oslo.policy/latest/cli/oslopolicy-convert-json-to-yaml.html.
JSON formatted policy_file support is deprecated since Victoria release. You need to use YAML format which will be default in future. You can use ``oslopolicy-convert-json-to-yaml`` tool to convert existing JSON-formatted policy file to YAML-formatted in backward compatible way: https://docs.openstack.org/oslo.policy/latest/cli/oslopolicy-convert-json-to-yaml.html.
Error gathering result from cell 00000000-0000-0000-0000-000000000000
Traceback (most recent call last):
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1276, in _execute_context
    self.dialect.do_execute(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/default.py", line 609, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 163, in execute
    result = self._query(query)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 321, in _query
    conn.query(q)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 505, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 724, in _read_query_result
    result.read()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 1069, in read
    first_packet = self.connection._read_packet()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 676, in _read_packet
    packet.raise_for_error()
  File "/usr/lib/python3.9/site-packages/pymysql/protocol.py", line 223, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/lib/python3.9/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1046, 'No database selected')

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/nova/context.py", line 422, in gather_result
    result = fn(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/db/sqlalchemy/api.py", line 206, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/objects/service.py", line 491, in _db_service_get_minimum_version
    return db.service_get_minimum_version(context, binaries)
  File "/usr/lib/python3.9/site-packages/nova/db/api.py", line 116, in service_get_minimum_version
    return IMPL.service_get_minimum_version(context, binary)
  File "/usr/lib/python3.9/site-packages/nova/db/sqlalchemy/api.py", line 251, in wrapped
    return f(context, *args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/db/sqlalchemy/api.py", line 438, in service_get_minimum_version
    return dict(min_versions)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/orm/query.py", line 3535, in __iter__
    return self._execute_and_instances(context)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/orm/query.py", line 3560, in _execute_and_instances
    result = conn.execute(querycontext.statement, self._params)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1011, in execute
    return meth(self, multiparams, params)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/sql/elements.py", line 298, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1124, in _execute_clauseelement
    ret = self._execute_context(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1316, in _execute_context
    self._handle_dbapi_exception(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1508, in _handle_dbapi_exception
    util.raise_(newraise, with_traceback=exc_info[2], from_=e)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/util/compat.py", line 182, in raise_
    raise exception
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1276, in _execute_context
    self.dialect.do_execute(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/default.py", line 609, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 163, in execute
    result = self._query(query)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 321, in _query
    conn.query(q)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 505, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 724, in _read_query_result
    result.read()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 1069, in read
    first_packet = self.connection._read_packet()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 676, in _read_packet
    packet.raise_for_error()
  File "/usr/lib/python3.9/site-packages/pymysql/protocol.py", line 223, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/lib/python3.9/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (1046, 'No database selected')
[SQL: SELECT services.`binary` AS services_binary, min(services.version) AS min_1 
FROM services 
WHERE services.`binary` IN (%(binary_1)s) AND services.deleted = %(deleted_1)s AND services.forced_down = false GROUP BY services.`binary`]
[parameters: {'binary_1': 'nova-compute', 'deleted_1': 0}]
(Background on this error at: http://sqlalche.me/e/13/e3q8)
Traceback (most recent call last):
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1276, in _execute_context
    self.dialect.do_execute(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/default.py", line 609, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 163, in execute
    result = self._query(query)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 321, in _query
    conn.query(q)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 505, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 724, in _read_query_result
    result.read()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 1069, in read
    first_packet = self.connection._read_packet()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 676, in _read_packet
    packet.raise_for_error()
  File "/usr/lib/python3.9/site-packages/pymysql/protocol.py", line 223, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/lib/python3.9/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1046, 'No database selected')

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/nova/context.py", line 422, in gather_result
    result = fn(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/db/sqlalchemy/api.py", line 206, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/objects/service.py", line 491, in _db_service_get_minimum_version
    return db.service_get_minimum_version(context, binaries)
  File "/usr/lib/python3.9/site-packages/nova/db/api.py", line 116, in service_get_minimum_version
    return IMPL.service_get_minimum_version(context, binary)
  File "/usr/lib/python3.9/site-packages/nova/db/sqlalchemy/api.py", line 251, in wrapped
    return f(context, *args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/db/sqlalchemy/api.py", line 438, in service_get_minimum_version
    return dict(min_versions)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/orm/query.py", line 3535, in __iter__
    return self._execute_and_instances(context)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/orm/query.py", line 3560, in _execute_and_instances
    result = conn.execute(querycontext.statement, self._params)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1011, in execute
    return meth(self, multiparams, params)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/sql/elements.py", line 298, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1124, in _execute_clauseelement
    ret = self._execute_context(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1316, in _execute_context
    self._handle_dbapi_exception(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1508, in _handle_dbapi_exception
    util.raise_(newraise, with_traceback=exc_info[2], from_=e)
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/util/compat.py", line 182, in raise_
    raise exception
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/base.py", line 1276, in _execute_context
    self.dialect.do_execute(
  File "/usr/lib64/python3.9/site-packages/sqlalchemy/engine/default.py", line 609, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 163, in execute
    result = self._query(query)
  File "/usr/lib/python3.9/site-packages/pymysql/cursors.py", line 321, in _query
    conn.query(q)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 505, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 724, in _read_query_result
    result.read()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 1069, in read
    first_packet = self.connection._read_packet()
  File "/usr/lib/python3.9/site-packages/pymysql/connections.py", line 676, in _read_packet
    packet.raise_for_error()
  File "/usr/lib/python3.9/site-packages/pymysql/protocol.py", line 223, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/lib/python3.9/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (1046, 'No database selected')
[SQL: SELECT services.`binary` AS services_binary, min(services.version) AS min_1 
FROM services 
WHERE services.`binary` IN (%(binary_1)s) AND services.deleted = %(deleted_1)s AND services.forced_down = false GROUP BY services.`binary`]
[parameters: {'binary_1': 'nova-compute', 'deleted_1': 0}]
(Background on this error at: http://sqlalche.me/e/13/e3q8)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/eventlet/hubs/hub.py", line 476, in fire_timers
    timer()
  File "/usr/lib/python3.9/site-packages/eventlet/hubs/timer.py", line 59, in __call__
    cb(*args, **kw)
  File "/usr/lib/python3.9/site-packages/eventlet/greenthread.py", line 221, in main
    result = function(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/utils.py", line 660, in context_wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/context.py", line 427, in gather_result
    result = e.__class__(e.args)
TypeError: __init__() missing 2 required positional arguments: 'params' and 'orig'