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Data Model Changelog
====================
Record changes to the ZooKeeper data model which require API version
increases here.
When making a model change:
* Increment the value of ``MODEL_API`` in ``model.py``.
* Update code to use the new API by default and add
backwards-compatibility handling for older versions. This makes it
easier to clean up backwards-compatibility handling in the future.
* Make sure code that special cases model versions either references a
``model_api`` variable or has a comment like `MODEL_API: >
{version}` so that we can grep for that and clean up compatability
code that is no longer needed.
* Add a test to ``test_model_upgrade.py``.
* Add an entry to this log so we can decide when to remove
backwards-compatibility handlers.
Version 0
---------
:Prior Zuul version: 4.11.0
:Description: This is an implied version as of Zuul 4.12.0 to
initialize the series.
Version 1
---------
:Prior Zuul version: 4.11.0
:Description: No change since Version 0. This explicitly records the
component versions in ZooKeeper.
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