You forgot Clojure. Riemann's monitoring config is written in Clojure. There's a much more approachable all-JS Riemann clone called Godot that I've successful

You forgot Clojure. Riemann's monitoring config is written in Clojure. There's a much more approachable all-JS Riemann clone called Godot that I've successfully used on multiple projects, but it still requires some work to make the frontend look good.