Fix Bugs Faster using Activity Tracing

Finding and diagnosing application bugs can be very difficult. Activity Tracing is a new technology that can dramatically improve your speed and efficiency finding bugs in your code. Log trace messages to an auto-generated ring buffer while associating them with the originating user action. Reduce the time sifting through unrelated log messages trying to understand what was going on when the failure happened.

WWDC 2014 - Session 714 - macOS, iOS