---
prelude: >
    The undercloud is now by default containerized and the deployment
    is not driven by instack-undercloud anymore but by TripleO Heat Templates
    like it's done for the overcloud.
upgrade:
  - |
    The upgrade from a non-containerized undercloud to a containerized
    undercloud is supported and can be executed with ``openstack undercloud
    upgrade`` command (same as before).