According to airbrake's gem in lib/airbrake/configuration:310

    `config.js_notifier has been deprecated and has no effect.  You should use <%= airbrake_javascript_notifier %> directly at the top of your layouts.  Be sure to place it before all other javascript.'`

If this were to be included, I think it should be in another area of the documentation stating that the Airbrake gem expects a host and api configuration and that you should point that to your servers. Something like:


    Airbrake.configure do |config|
      config.host = 'YOUR-ERRIBT-HOST'
      config.api_key = 'YOUR-PROJECT-API-KEY'
    end