I just look at our code, and, because, when we created our app, the “created_by” field was an unofficial hidden field, we use the older story, to suppose who created the task.
I know that it’s not the best solution, because stories can be deleted, and when we copy a task, we can lose them I think. But, we don’t use the “created_by” opt_field directly.
When I look at the documentation, in the “task” section and schema task also, there’s nothing about the created_by field.
And, in another post, @Joe_Trollo said it was a mistake in the documentation, but a few years later, it’s still missing from the official doc!
So, I don’t know if we can really use it…