You probably need to find the right the log path. "alert" isn't a facility, it's a priority, so I think you're missing the other half - it's most likely one of the local facilities, or something like user.log.
if it's something you're syslogging, though, you might be able to press the "Scan for New Nodes" button and go from there. If enough messages have been sent it should be able to auto-configure.