--- upgrade: - | The default value of ``[oslo_policy] policy_file`` config option has been changed from ``policy.json`` to ``policy.yaml``. Nova policy new defaults since 21.0.0 and current default value of ``[oslo_policy] policy_file`` config option (``policy.json``) does not work when ``policy.json`` is generated by `oslopolicy-sample-generator `_ tool. Refer to `bug 1875418 `_ for more details. Also check `oslopolicy-convert-json-to-yaml `_ tool to convert the JSON to YAML formatted policy file in backward compatible way. fixes: - | Bug `1875418 `_ is fixed by changing the default value of ``[oslo_policy] policy_file`` config option to YAML format.