(Updated 3/21/2019) If you ever wondered why you should keep up to date with your server installations, this IBM Technote published today describes one really good reason. Less than a year ago Google announced they are deprecating Google Cloud Messaging (GCM) and have replaced it with Firebase Cloud Messaging (FCM). Google will remove GCM support at any time on or after April 11, 2019 (3 weeks from today).
Why do you care? This service is used by IBM Traveler (server) to communicate with Android devices (Verse for Android). When Google made this announcement, IBM quickly incorporated the new service into the latest Android Verse app (V10.0.4) and the latest release of the Traveler server code stream (V10.0.1). NOTE: This is the Traveler version, NOT the version of Domino that Traveler is running on. Traveler V10.0.1 works on Domino 9.0.1. Yes, if you are running Traveler on Websphere, you still need to upgrade Traveler.
If you get automatic updates from the app store, you will already have this version of the app on your device. If you have automatic updates disabled, be sure to update this app before April 11, 2019. But Traveler on your server still needs to be upgraded.
If you are using IBM SmartCloud Notes (IBM Connections Cloud) for your email service, you have nothing to worry about. IBM already took care of it for you.
Read this IBM Technote for details.