This question is an exact duplicate of:
- Debug Android vibration 1 answer
Is there a way to test vibrations on the Virtual Devices that come with Android Studio?
I tried searching logcat and it seems like there isn't any indication of when the Android device is vibrating or not.
Did you try this?
(Look into this answer: Debug Android vibration)
Othere than that, if you are writing the code, the vibration is called with the method
You could write a wrapper around this or create your own vibrator class to add some specific logging next to the vibration call itself.