The usual things that :observer shows is quite nice, other than that the usual things that webservers can usually log, in addition to things that something like awstats shows (I use it a lot). ^.^

I like the idea of Awstats in a Phoenix app too

The project is currently in a closed alpha (you can sign up for the waitlist at https://pryin.io) and it’s not actually phoenix-only. You could still use it to keep track of beam metrics like how much memory is used and by what (ETS, atoms, binary, …), data about garbage collection, processes (number of processes, reductions, scheduler usage, …).

If you connect your phoenix app, you get metrics about how long controller and channels take, which ecto queries are run (and how long they take), and a lot more