According to reports the Android 15 update has added a surprising new feature called “Notification cooldown.” This feature will gradually lower the volume of successive notifications for a time.
The Notification cooldown option is found at the bottom of the notification settings section, where it is possible to set it to either set it to apply a cooldown to all notifications, a specific conversation, or not at all. It's a simple enough feature to add, but one that might be hugely popular with people who are inundated with notifications but can’t risk putting their phone on silent.
