The default config of Airbrake's gem will crash multithreaded Rails servers

Summary: There is a bug in Airbrake's gem that will cause a connection-pool leak in multithreaded Rails instances. This leak will eventually cause your app to crash.

I'm posting this here because this is a very common configuration and I imagine there a lot of people dealing with unexpected Rails crashes that are hard to track down.

The bug is actually fixed in master, Airbrake just needs to push a new gem.