In software development, application monitoring can be defined as the process which ensures that our application performs in an expected manner. This process allows us to measure and evaluate the performance of our application and can be helpful to find bottlenecks or hidden issues.
Application monitoring is usually made through a specialized software that gathers metrics from the application or the infrastructure that runs your software. These metrics can include CPU load, transaction times, or average response times among others. Anything you can measure can be stored in your telemetry system so you can analyze it later.
Monitoring a monolithic application is easy; you have everything in one place, all logs are stored in the same place, all metrics can be gathered from the same host, you can know if your PHP thread is killing your server. The main difficulty you may find is finding the part of your application that is underperforming, for example, which part of your...