Comment 1 for bug 1410372

AIUI, RESTErrors are ones that are intended to be serialized and shipped back to Ironic. That can only happen after lookup. So I sorta mentally categorized them as "pre-lookup (meaning we don't know what Ironic node we are)" and "post-lookup" (meaning we know what Ironic node we are and are actively heartbeating).

But according to Jim, and this makes sense to me too, all the errors could be made RESTErrors and work just fine. So we should do that.