=== Configuration You should have something like this in config/initializers/hydraulic_brake.rb. HydraulicBrake.configure do |config| config.api_key = '1234567890abcdef' end (Please note that this configuration should be in a global configuration, and is *not* environment-specific. HydraulicBrake is smart enough to know what errors are caused by what environments, so your staging errors don't get mixed in with your production errors.) You can test that HydraulicBrake is working in your production environment by using this rake task: rake hydraulicbrake:test If everything is configured properly, that task will send a notice to Airbrake which will be visible immediately.