There are Feature Freeze Exception BPs [1][2][3] for Keystone that will cause string changes after string freeze.

I am bringing these to the attention of this list per the wiki [4].

[1] https://blueprints.launchpad.net/keystone/+spec/domain-config-ext

[2] https://blueprints.launchpad.net/keystone/+spec/idp-id-registration

[3] https://blueprints.launchpad.net/keystone/+spec/ecp-wrapped-saml-assertions

[4] https://wiki.openstack.org/wiki/StringFreeze