check.rb

#!/usr/bin/env ruby
# 
# Usage: check.rb <time>
#

require 'rubygems'
require 'bundler/setup'
require 'newrelic_rpm'

class Check
  include NewRelic::Agent::Instrumentation::ControllerInstrumentation

  attr_reader :opts

  def initialize(opts={})
    @opts = opts
  end

  def model(opts={})
    i = opts[:time]
    sleep(i)
    raise [Exception, RuntimeError, StandardError][rand(2)] if rand(i) == 1
    return i
  end

  def view(data)
    i = data
    sleep(rand(i) / 5)
    raise [Exception, RuntimeError, ArgumentError][rand(2)] if rand(i) == 2

    puts "OK: we made it!"
  end

  def run
    data = model(@opts)
    view(data)
  end

  add_transaction_tracer :run,   :name => 'run', :class_name => '#{self.class}', :params => 'self.opts'
  add_method_tracer      :model, 'Nagios/#{self.class.name}/model'
  add_method_tracer      :view,  'Nagios/#{self.class.name}/view'
  newrelic_ignore_apdex
end

at_exit do
  puts "Saving New Relic data"
  NewRelic::Agent.save_data
end

NewRelic::Agent.manual_start
Check.new(:time => ARGV[0].to_i).run

collector.rb

#!/usr/bin/env ruby
# 
# Usage: collector.rb 
#

require 'rubygems'
require 'bundler/setup'
require 'newrelic_rpm'

module NewRelic
  module Agent
    def self.connected?
      agent.connected?
    end
  end
end

$stdout.sync = true
NewRelic::Agent.manual_start

print "Waiting to connect to NewRelic Service"
until NewRelic::Agent.connected? do
  print '.'
  sleep 1
end
puts

NewRelic::Agent.load_data
NewRelic::Agent.shutdown(:force_send => true)

Gemfile

#!/usr/bin/env ruby

source :rubygems

gem "newrelic_rpm"