license_usage.log abnormality & ?

[carmackd]

I'm noticing quite a few license usage events with an empty host (h=) and empty source (s=) field, any ideas what could be the cause?

12-01-2011 13:10:49.179 +0000 INFO LicenseUsage - s="" st="syslog" h="" o="" i="DC1234B7-000-4563-82FA-9D8C424FD3WW" pool="XXX" b=480344

Also, what information is provided in the i= and o= fields?

[carmackd]

i= the guid of the corresponding indexer, but I would still like to know why I am seeing blank values in the h field.