---
features:
  - |
    Added a new meta_version_to_write for the keymaster config.
upgrade:
  - |
    When upgrading from Swift 2.20.0 or Swift 2.19.1 or earlier, set
    meta_version_to_write to 1. When upgrading from 2.25.0 or earlier, set
    meta_version_to_write to 2. After upgrading all proxy servers, set this to
    3 (currently the highest version).
critical:
  - |
    Failing to set the correct version of meta_version_to_write can lead to
    unrecoverable data.