Notification Functionality Guide

Hi, 

Is there a way to get the Notification functionality in our Help Centre (ZD Guide) the same Zendesk uses for their Help Centre? Are there any third party apps I am missing or should it (or is it?) a native functionality? 

It would be very convenient for our end-users as well as our employees who get @mentioned and right now receive multiple emails. They'd rather check the notification right within our Help Centre.