This is internal API which was never meant to be used by project implementors, thats why nothing is mentioned in the migration notes.
If you really need the name of the process resource you can use this API.
String pid = MetaData.getProcessElementId()
DiCore.getGlobalInjector().getInstance(IProcessManager.class).findProcess(pid ).getName();
** of course this new API is internal as well. the API can change in the future! **