Release : 15.8.1
Component : Clarity Scheduler
The problem has been investigated on DE64185 and confirmed that the problem was resolved in 15.9.3 (DE58162).
However, after you set up Alternate Logs Directory, you need to redeploy the services (i.e. service stop remove add deploy start app) to populate the access logs in alternate directory.
Also, for old access logs, please manually move them to the new logs folder.