IssueTracker

Also we need to add following for activities and fragments using VIewModel with to start:

## Android architecture components: ViewModel
-keepclassmembers class * extends android.arch.lifecycle.ViewModel {
<init>(...);
}

Update:

Managed to get https://github.com/googlesamples/android-architecture-components/tree/master/BasicSample working with the following set of rules:

## Android architecture components: Lifecycle
# generated GenericLifecycleObserver and it's empty constructor is considered to be unused by proguard
-keepclasseswithmembers class * implements android.arch.lifecycle.GenericLifecycleObserver {
<init>(...);
}
# keep Lifecycle State and Event enums with fields
-keepclassmembers class android.arch.lifecycle.Lifecycle$* { *; }
# keep methods annotated with @OnLifecycleEvent even if they seem to be unused
# (Mostly for LiveData.LifecycleBoundObserver.onStateChange(), but who knows)
-keepclassmembers class * {
    @android.arch.lifecycle.OnLifecycleEvent *;
}
# ViewModel's empty constructor is considered to be unused by proguard
-keepclassmembers class * extends android.arch.lifecycle.ViewModel {
<init>(...);
}

Not quite sure if it's the final version (I think we can prettify it a bit), but everything seems to work fine.