When you have some chat app (like whatsapp) that make vibrate/sound/both on any incoming message, and someone sends you like 10 messages in a row it can be very annoying
What this feature does is limit the number of times an app (single-app) can make a notification.
You define a time-frame, and any extra notification within this time-frame (=annoying notification) will be stripped down from its sound/vibrate/both data (but will be shown).
So, It's done!
Please download from Xposed Repo to get update notifications