---
features:
  - |
    Now scheduler plugins are aware of operation type via ``operation`` attribute in
    RequestSpec dictionary, plugins can support backend filtering according to backend
    status as well as operation type. Current possible values for ``operation`` are:

    - create_volume
    - extend_volume
    - create_snapshot
    - retype_volume
    - migrate_volume
    - manage_existing
    - manage_existing_snapshot
    - create_group