---
prelude: >
    A new database schema migration is included in this release to fix
    `bug 1635446 <https://bugs.launchpad.net/nova/+bug/1635446>`_.
fixes:
  - |
    Contains database schema migration
    ``021_build_requests_instance_mediumtext`` which increases the size of the
    ``build_requests.instance`` column on MySQL backends. This is needed to
    create new instances which have very large ``user_data`` fields.