XF 2.2 Push notifications tracking

[Kalidor]

Is there a way to determine which users have push notifications enabled?

 

[Kirby]

SELECT COUNT(DISTINCT user_id) FROM xf_user_push_subscription

SELECT user_id, username FROM xf_user WHERE user_id IN (SELECT user_id FROM xf_user_push_subscription)

 

[fionix]

Is there a plugin / add on or something that can be used inside the normal stats?

Interested to know this number too.