Whenever we create an application, it goes through multiple phases, such as requirement analysis, design, development, and finally deployment. The real test of an application starts after deployment. Think of a scenario where a user of an application comes to a development team complaining that they are not able to access the application, or some of the pages are throwing an error or behaving in an unexpected manner.

Where should we start looking for the problem? Is there a problem with the current user account or with the application itself? Is some code not behaving as it should?

Monitoring the application comes to the rescue. It not only helps us to find issues in cases such as those just mentioned, but also helps us to proactively understand the problems in our application, such as whether a service is down or taking too much time to respond.