droppedDeviceInactive property
The percentage of accepted messages that were dropped because the target device is inactive.
FCM will drop messages if the target device is deemed inactive by our servers. If a device does reconnect, we call [OnDeletedMessages()](https://firebase.google.com/docs/cloud-messaging/android/receive#override-ondeletedmessages) in our SDK instead of delivering the messages.
Implementation
core.double? droppedDeviceInactive;