Where is logName used?

The following code:

.log(LoggingLevel.ERROR, "com.foo.server.ngw.router",
"Account Not Found. Message discarded.").stop();

Results in the following in the log:

10:12:11,690 ERROR org.slf4j.helpers.MarkerIgnoringBase:145 error() -
Account Not Found. Message discarded.

I was expecting to see com.foo.server.ngw.router somewhere above? Not sure
what else it is supplied for..?

James