numberOfSuppressedNotifications

The number of notifications that were not presented to the user because they were suppressed.

Notifications may be suppressed by the component responsible for presenting them to the user (typically the system UI) as it deems fit. It can make this decision based on the notification's properties and (indirectly) the input from various domains, such as the state of the vehicle. For example, when the driver is taking an exit on the highway, showing a notification for a text message may be too distracting for the driver.