Log is a critical part of an application. It serves as an eye to the programmer on how the application is working while debugging. Especially for applications running on production environment, if the application encounters problem and the problem cannot be reproduced on other environments, log will be extremely useful.While log is essential, but developers have to log smartly. Because if don't put log smartly, you may not get what you want while debugging or you may get too many redundant logs which eat up the disk space and degrade the performance of the system.So what and wha...