[tombert]

Generally speaking if you're adding another field to a JSON or something, that doesn't really break the parser [1] or affect downstream. While you should still probably let the downstream teams know, it's not necessarily going to break anyone's code.

[1] I'm aware that that's not always true (e.g. adding a field that's ridiculously large choking up the parser).

[darrylb42]

or you have a customer that has strict validation on and adding a field breaks their ability to deserialize.