HealthKit watchOS 5.1 to 5.2 API Differences

HKMetadata.h

Added HKMetadataKeyHeartRateEventThreshold

HKTypeIdentifiers.h

Added HKCategoryTypeIdentifierHighHeartRateEvent

Added HKCategoryTypeIdentifierLowHeartRateEvent

Added HKCategoryTypeIdentifierIrregularHeartRhythmEvent