Be able to subscribe to a concrete App in the Gallery so you can receive an email or notification when an App is updated. Several times I have been using an App that suddenly stops working properly because there's a new version available, but actually there's no way to be aware of this unless you check the date of the last version updated.
It will be ideal if you could subscribe to the app to receive new updates notifications or if Alteryx Designer could give automatically notifications of updates in the Gallery of Apps you have installed.