It was running ok till yesterday all the logs are stored with Hostname and date format

after upgrade the hostname not able to log in the log format, what is the fix ?

Looks like after upgrade to new 3.13 my logs no longer able to use hostname

it is storing like this :-2017-12-11.log

before INET-2017-12-11.log ( INET Missing why ) any changes ? in the new code 3.13 ?