---
prelude: |
    Vitrage Stein release contains some significant changes:

    - New and simplified template language! the new templates are shorter and
      much easier to understand and reuse:
      https://docs.openstack.org/vitrage/latest/contributor/vitrage-templates.html
    - Added a Trove datasource and a Zaqar notifier.
    - New APIs for querying Vitrage services and for resource count.
    - Performance improvements and faster data retrieval. The memory signature
      and processing runtime were significantly reduced.