Elixir has the ability to call Erlang modules, and one of those modules that is handy for debugging is called Observer.

iex(1)> :observer.start

In a graphical environment, this starts up a pretty nice graphical tool, although you might get a warning message:

Gtk-Message: 17:51:14.716: Failed to load module "canberra-gtk-module"

Correcting this error message is as simple as installing the correct modules:

sudo apt install libcanberra-gtk-module libcanberra-gtk3-module

After doing this, starting observer should result in the familiar :ok and a graphical application for looking at the running system.