highlight that the output_schema change is a breaking change
@@ -28,7 +28,11 @@ Added
Changed
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-* ``output_schema`` must be a full jsonschema now. If a schema is not well-formed, we ignore it.
+* BREAKING CHANGE for anyone that uses ``output_schema``, which is disabled by default.
+ If you have ``[system].validate_output_schema = True`` in st2.conf AND you have added
+ ``output_schema`` to any of your packs, then you must update your action metadata.
+
+ ``output_schema`` must be a full jsonschema now. If a schema is not well-formed, we ignore it.
Now, ``output`` can be types other than object such as list, bool, int, etc.
This also means that all of an action's output can be masked as a secret.
