@eskimo
Thanks a lot for the prompt reply, you are right we can filter by subsystem which is great.
Upon further investigation I realised these aren't debug messages that got printed, they were errors (not sure why though).
When I set the launch arguments as com.apple.CoreData.Logging.stderr 0 (under Scheme > Run > Arguments) I don't get these errors anymore.
The only question remaining is why are these errors thrown, I even tried with Xcode > New Project > Checking CloudKit and CoreData checkboxes, even on the new project with generated code these errors are thrown.
Tested on device with iCloud turned on, syncing is fine but not sure if I am missing something or this is a internal error within the framework.
FB FB11794798 - Feedback contains sample project