Nothing to worry about, this is totally normal.
Look back through your old logs, (use grep for example), and you'll see it's a regular event in the log.
Mr Claymore would be the only person who can explain why he's programmed this, but no doubt there is a logical reason.

Side note: Generally, (assuming the programmer is not a total moron), log entries will have some prefix, or suffix, "warning", "error", "OK", "good" etc etc, which makes life easier when searching logs for problem events, or notable events you might like to check on.

Conversely, if you don't see such annotations, and the log entry is not self explanatory, you can generally ignore such entries. (as in they are not things you need to worry about).

And No, it's not a virus either.