Understanding FCM Message Delivery on Android
Blog post from Firebase
Firebase Cloud Messaging delivery reports classify Android push messages as delivered, pending, collapsed, dropped because of excessive pending messages, dropped after an app is force-stopped, dropped for inactive devices, or expired by their time-to-live setting. Delivered messages do not necessarily mean a notification banner was displayed, while offline devices, Doze mode, stopped users, and throttling can cause expected or unexpected delivery delays. Developers can reduce avoidable drops by using collapse keys where appropriate, setting suitable TTL values, managing stale registration tokens, handling the onDeletedMessages callback with server synchronization, and avoiding large queues of non-collapsible messages for disconnected devices. For deeper analysis, FCM supports analytics labels, aggregated delivery data, and troubleshooting tools, although delivery metrics should be interpreted as trends because not all statuses are included and totals may not equal 100 percent. The post also notes that Google Play Services may proxy eligible high-priority notification messages, which can affect how delivery and app-receipt analytics are reported.
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