We use lager for our logging at Electric Imp. This morning I had cause to tweak the configuration at runtime on one of our staging boxes, but first I needed to figure out which handlers were already installed.

If you’re using lager for your Erlang logging, you’ve probably left the default formatter well alone, by doing something like this in your configuration file:

You’re using lager for logging in your Erlang program, and you discover that your configuration isn’t logging anything more verbose than info-level messages. How do you bump that up to debug?