LiveData официально устарела и больше не поддерживается Google. Мигрируй на Flow.

https://d.android.com/reference/android/arch/lifecycle/LiveData
https://developer.android.com/reference/android/arch/lifecycle/LiveDataReactiveStreams
https://developer.android.com/reference/android/arch/lifecycle/MediatorLiveData
https://developer.android.com/reference/android/arch/lifecycle/MutableLiveData

LiveData

MediatorLiveData

observe

observeForever

viewLifecycleOwner

setValue

postValue

map

switchMap

distinctUntilChanged

liveData

asLiveData