---
features:
  - |
    Support has been added for `microversion 2.91`_. This microversion
    allows specifying a destination host to unshelve a shelve
    offloaded server. And availability zone can be set to None to unpin
    the availability zone of a server.

    .. _microversion 2.91: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#microversion-2-91