If you kill the server without invoking a normal shutdown, tmp files are not cleaned out. This leaves old webapp folders lingering until a normal shutdown.

./tmp/jetty-0.0.0.0-8443-redhat-branding.war-_redhat-branding-any-3285121346946007361.dir
./tmp/jetty-0.0.0.0-8443-console.war-_console-any-4977922188149081743.dir/
./tmp/jetty-0.0.0.0-8443-artemis-plugin.war-_artemis-plugin-any-4959919418401315172.dir

In a failover test environment that repeatedly kills the server, this causes disk space usage issues.