private static boolean useSideChannelForNotification(Notification notification) {
        Bundle extras = NotificationCompat.getExtras(notification);
        return extras != null && extras.getBoolean(EXTRA_USE_SIDE_CHANNEL);
    }
Returns true if this notification should use the side channel for delivery.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationManagerCompat.java