AppSignal is easily the most easily integrated APM I've used for Elixir + Phoenix. A lot is set up for you by just integrating the libraries. In particular, the logging integration keeps everything in one place which I really appreciate.

We are able to maintain graphs, dashboards and statistics under control in an easy an seamless way. We can better analyze performance problems, track down where issues arise all within a tool. We have easily integrated AppSignal with our Rails application and since then we are constantly using the tool to track down metrics.

It provides all the important tools for monitoring our application. It's really simple to implement it and with AppSignal we are able with ease diagnose any potential issues with our application and keep it running without any problems. They keep improving their services and customer support is fantastic.