Monitoring Puma web server with Prometheus and Grafana

Localizing web application performance problems and response latency could be tricky in the projects with complex infrastructure.And having monitoring for all the services is highly crucial.Sometimes performance degradation might be induced one step ahead of the main application because of the lack of the web server capacity. As the most popular web server for running Ruby web applications is Puma, let me explain how to implement and tune up the simple monitoring for it.