a05b3497_iOS_Keys_Table_1_Summary_of_UIKit_keys_Summary
[Key] NSHealthUpdateUsageDescription [Xcode name] "Privacy - Health Update Usage Description” [Availability] iOS 8.0 and later [Summary] 
Specifies a localized string that describes why the app wants to write data to the HealthKit store. See NSHealthUpdateUsageDescription for details.
iOS Keys