The code can become a real mess if each of the .subscribe() blocks have their own error-handling mechanisms. Quite often, the error-handling code is the same, and it is just a waste of time copying and pasting the same handlers around. Furthermore, if there is a need to change the way the logging works, it would have to be changed all over the place again.

In this section, we will explore a few ways of implementing a centralized logging solution so that it's easy to maintain and use.