---
prelude: |
    Welcome to the Yoga release of the OpenStack Block Storage service
    (cinder).  With this release, the Block Storage API version 3 has
    reached microversion **3.68**.  The cinder team would like to
    bring the following points to your attention.  Details may be
    found throughout this document.

    * Microversion 3.67 is introduced as a marker to indicate that
      any instance of the Block Storage API 3.67 or greater treats
      a project_id in the URL as optional.  This change is backward
      compatible: the API can handle legacy URLs containing a project_id
      as well as URLs without a project_id.  This is the case regardless
      of what microversion specified in a request.  See the "New
      Features" section for details.

    * Microversion 3.68 introduces a new volume action, ``os-reimage``,
      that allows a user to replace the current content of a specified
      volume with the data of a specified image supplied by the Image
      service (glance).  See the "New Features" section for details.

    * Some new backend storage drivers have been added, and many current
      drivers have added features and fixed bugs.