title: Any way to debug app with dataset in production environment?
body: <p>My <code>CloudKit</code> dataset in <code>Production Environment</code> is somewhat bigger than <code>Development</code>, and other exotic difference could exist. </p>
  
  <p>There is a nasty <a href="https://stackoverflow.com/questions/29731285/strange-dispatch-group-phenomenon">deadlock</a> using my app in Production Mode. Is it possible to debug client in any way? Or should I log as many thing as possible and send somehow out?</p>
  
  <p>It is a threading issue, so without examining threads in Xcode it is really though to do anything. Any idea? I am using Core Data to local storage.</p>