Crossed bell on notification meaning in CM12's Lollipop I'm using OnePlus One (bacon) running CM12 Unofficial (daleski75's build). If you long-press a notification, you could see a crossed bell on some app.



It seems to permanently mute every notification with the same text inside. A new notification with a different text from the same app is shown as usual.

Is that the meaning of that button? How can re-enable notifications with the same text?
In Android 5.0 (at least in the CM12 Unofficial builds) you can go to Settings -> Privacy 



From there go in to Filter Notifications. Clicking on an item will allow you to see when it was last blocked and remove it from the list.