Disable Heat by default

Author: Alex-Welsh

doc/source/operations/upgrading.rst

@@ -35,8 +35,24 @@ Notable changes in the |current_release| Release
 There are many changes in the OpenStack |current_release| release described in
 the release notes for each project. Here are some notable ones.
 
-TODO
-----
+Heat disabled by default
+------------------------
+
+The Heat OpenStack service is no longer enabled by default.
+
+This behavior can be overridden manually:
+
+.. code-block:: yaml
+   :caption: ``kolla.yml``
+
+   kolla_enable_heat: true
+
+Wherever possible, Magnum deployments should be migrated to the CAPI Helm
+driver. Instructions for enabling the driver can be found `here
+<../configuration/magnum-capi.rst>`_. Enable the driver, recreate any clusters
+using Heat, and disable the service.
+
+TODO: guide for disabling Heat
 
 Known issues
 ============

etc/kayobe/kolla.yml

@@ -559,7 +559,7 @@ kolla_enable_grafana: true
 #kolla_enable_hacluster:
 #kolla_enable_haproxy:
 #kolla_enable_haproxy_memcached:
-#kolla_enable_heat:
+kolla_enable_heat: false
 #kolla_enable_heat_horizon_policy_file:
 #kolla_enable_horizon:
 #kolla_enable_horizon_blazar:

releasenotes/notes/disable-heat-03f3ac52ac610223.yaml

@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    The Heat OpenStack service is now disabled by default. 
+upgrade:
+  - |
+    The Heat service is now disabled by default. This behaviour can be
+    overriden by setting `kolla_enable_heat: true` in `etc/kayobe/kolla.yml`.
+    It is recommended that you migrate to the CAPI Helm driver for Magnum
+    wherever possible.