2024.1 upgrade docs: delete Heat endpoints

Author: MoteHue

doc/source/operations/upgrading-openstack.rst

@@ -82,6 +82,10 @@ Then from the OpenStack CLI:
    openstack user delete heat
    openstack domain set --disable heat_user_domain
    openstack domain delete heat_user_domain
+   # Gather the heat endpoint UUIDs
+   openstack endpoint list | grep heat
+   openstack endpoint delete <external-heat-cfn-uuid>
+   openstack endpoint delete <internal-heat-cfn-uuid>
 
 You can drop the ``heat`` database too, unless you want to keep historical content.