With the iOS agent, you can report app launch time, also known as "cold time" and "hot time." Note: Warm and prewarmed times are not reported.
View app launch time
This feature is available for agent versions 7.4.0 and higher.
Your app launch time is reported with the
AppLaunch/Hot metrics, which can be viewed in the Metric Explorer in NR1.
Note: App Launch times are not reported when using Simulators or during debugging.