Passenger support?

[martinlevesque]

I was wondering if this gem can be used with Passenger ( https://github.com/phusion/passenger ) to have heroku language runtime metrics working ( https://devcenter.heroku.com/articles/language-runtime-metrics-ruby )?

Did a quick test with the required configs, and before_fork is not available with Passenger, which makes it crashes.
Can the gem works with passenger by having the following initializer:

require 'barnes'

Barnes.start

?