Users might like to see additional information with the exception. API consumers should pull this out of properties on your child class, but the parent class might not be able to deal with the arbitrary types at runtime the children can introduce, so bringing them all down to strings simplifies that.

Overrides should always call super.getAdditionalPrintableInformation(sink); before adding additional information by calling the sink with other arguments afterward.

You should spare no expense in preparing this information - translate error codes, build rich strings, whatever it takes - to make the information here useful to the reader.