---
features:
  - |
    Allows limiting the number of parallel downloads for cached images
    (instance and TFTP images currently).
upgrade:
  - |
    The ``parallel_image_downloads`` option is now set to ``True`` by default.
    Use the new ``image_download_concurrency`` option to tune the behavior,
    the default concurrency is 20.
deprecations:
  - |
    The ``parallel_image_downloads`` option is deprecated in favour of
    the new ``image_download_concurrency`` option that allows more precise
    tuning.