Here are good ways you can follow during and after upgrading:
Monitor the server console/log file to be aware of the upgrade status or any issues during the upgrade. By default, eXo Platform records all information in :
$PLATFORM_TOMCAT_HOME/logs/platform.log(in Tomcat)$PLATFORM_JBOSS_HOME/standalone/log/server.log(in JBoss)$NATIVE_INSTALLER_DIR/apps/exoplatform/logs/platform.log(in the Native Installer)
Check the eXo Platform version via the REST service (http://[your_server]:[your_port]/rest/platform/info), for example: "platformVersion": "4.3.1".
Or, you can see the new version in the footer of Login page as follows:
Logging in and check some functions (share activity, add a document, add user, …), components and customizations to see if they are working correctly.