New Relic API Rackup

new_relic_agent_instrumentation_api.rb

if Rails.env.production?

  require 'new_relic/agent/instrumentation/controller_instrumentation'

  module NewRelic
    module Agent
      module Instrumentation
        module API
          def newrelic_request_headers
            @newrelic_request.env
          end
          def call_with_newrelic(*args)
            @newrelic_request = ::Rack::Request.new(args.first)
            path = @newrelic_request.path.split('/').delete_if { |p| p.blank? }.join('_')
            method = @newrelic_request.request_method.downcase
            perform_action_with_newrelic_trace(
              :category => :rack, 
              :path => "#{path}\##{method}",
              :request => @newrelic_request) do
              result = call_without_newrelic(*args)
              # Ignore cascaded calls
              MetricFrame.abort_transaction! if result.first == 404
              result
            end
          end
          def self.included middleware #:nodoc:
            middleware.class_eval do
              alias call_without_newrelic call
              alias call call_with_newrelic
            end
          end
          include ControllerInstrumentation
          def self.extended middleware #:nodoc:
            middleware.class_eval do
              class << self
                alias call_without_newrelic call
                alias call call_with_newrelic
              end
            end
          end
        end
      end
    end
  end

end

Thanks for the snippet.

I get a stack level too deep, though.
The only additional information i get is: actionpack (3.2.2) lib/action_dispatch/middleware/reloader.rb:70

I followed your instructions and tried it with newrelic_rpm 3.3.4 and 3.1.2....both end up with stack level too deep.

I use ruby 1.9.3p125 and rails 3.2.2
Any ideas?

I have this in production with "rpm_contrib", "2.1.8" and "newrelic_rpm", "3.3.3". What's on the stack?

Sorry, was my fault.
i used both:
extend NewRelic::Agent::Instrumentation::Rack
AND
extend NewRelic::Agent::Instrumentation::API

Now i only use extend NewRelic::Agent::Instrumentation::API and it works fine.

We no longer use this instrumentation and have reworked it. Check out [this blog post](http://artsy.github.com/blog/2012/11/29/measuring-performance-in-grape-apis-with-new-relic] for details.

We no longer use this instrumentation and have reworked it. Check out this blog post for details.