meter.rb

require 'rubygems'
require '../lib/ruby-metrics/integration/webrick'

@metrics = Metrics::Agent.new
@metrics.start :port => 8081 # optional

timer = @metrics.meter :my_meter
timer.mark(500)

step = 0

# This is here so that we will run indefinitely so you can hit the 
# status page on localhost:8081/stats
loop do
  sleep 1
  
  modifier = rand(200).to_i
  step += 1
  
  if (step % 2)
    modifier *= -1
  end
  
  timer.mark(500  + modifier)
end