Live Instruments allow developers to easily debug live production applications without leaving their IDE. There are currently four types of live instruments:
Live Breakpoints (a.k.a. non-breaking breakpoints) are useful debugging instruments for gaining insight into the live variables available in production at a given scope.
Live Logs (a.k.a. just-in-time logging) are quick and easy debugging instruments for instantly outputting live data from production without redeploying or restarting your application.