We have not done any code change here but why this error message came now

Because only now you have invoked that code path?

logdie is logdie, if you open up that file and look at it, the exit is in logcroak

If you grep the source/pod/dist for logcroak, you'll find talk of  use Log::Log4perl qw(:no_extra_logdie_message);

So there you have it, your program is using some flavor of LOGEXIT/LOGDIE , and log4perl does its job