On 4.3.2 I used to able to run this search to check input modules loaded..
index=_internal source=*splunkd.log splunklogger "*/input/* loaded" | dedup message
Seems it doesn’t work on 5.X?
Looks like now its under loader not splunklogger and ya gotta go look at composite.xml for details.
02-13-2013 16:35:06.875 -0500 INFO loader - loading modules from /home/stua/opt/splunk/etc/modules
02-13-2013 16:35:06.877 -0500 INFO loader - Writing out composite configuration file: /home/stua/opt/splunk/var/run/splunk/composite.xml