In the world of system development, monitoring and alerting is often overlooked, especially by those without prior experience. Some may even think it's unnecessary, assuming that whenever a bug occurs, it can simply be fixed later. However, this approach is totally incorrect! By analogy, we can consider a system as a human body. A person may appear healthy on the surface, but may be hiding underlying health issues that need to be addressed promptly. Similarly, a system may seem to be functioning normally, yet it may be harboring potential problems that can lead to unexpected errors or even crashes. It is hence crucial to implement robust monitoring and alerting mechanisms to ensure smooth system operation and minimize downtime. This article will delve into the importance of monitoring and alerting in system development, discussing the various tools and techniques available to help you get started.