---
upgrade:
  - |
    Configuration options related to RPC topics were deprecated in the past
    releases and are now completly removed from nova. There was no need to
    let users choose the RPC topics for all services. There was little
    benefit from this and it made it really easy to break Nova by changing
    the value of topic options.

    The following options are removed:

    - ``compute_topic``
    - ``console_topic``
    - ``consoleauth_topic``
    - ``scheduler_topic``
    - ``network_topic``