---
features:
  - |
    DEFAULT_SERVICE_REGIONS can now take '*' as a key which serves either as a
    fallback service region, or the default region if no other keys are set.
upgrade:
  - |
    [:bug:`1772345`]
    ``DEFAULT_SERVICE_REGIONS`` no longer overrides the cookie value from
    ``services_region``. This fixes the UX where a user controlled value
    keeps being overridden by a setting and changes ``DEFAULT_SERVICE_REGIONS``
    to act as a default (as the name implies) per endpoint if the cookie is not
    set rather than an override. The cookie will still be overridden when
    it is for a region not present in the user's current catalog, so this will
    still handle the original multi-keystone case that requried the
    introduction of ``DEFAULT_SERVICE_REGIONS``.