How to be notified about applications to private groups?

We are using one private group, but I don’t seem to have a way of being notified when someone applies to join the group. 

This article tells me how to approve people to join, but doesn’t mention if I should be notified of new applications. Am I to understand the current solution is to just check daily for new applications? Or is there a notification I am missing? 

Assuming notifications do not exist, this another reason I’d like to see the idea below implemented so that I might hide groups for all except certain user roles. Please vote for it if you also would like to see it implemented.