Monitoring external services with Prometheus and Grafana

Time ago, web-applications depended only on self-written code or libraries. It was easy to diagnose any problem, plainly investigating how an application work.Today, modern web-applications tend to have many external dependencies, such as microservices or external SaaS. It makes your system depend not only on the internal factors but on the reliability of external services as well. When something fails, it's essential to localize a problem and find out which side caused it.