gistfile1.rb

#!/usr/bin/ruby

require 'json'

host = 'graphite.example.com'
port = 2003

now = Time.now.to_i
stats = ''
# <metric path> <metric value> <metric timestamp>
JSON.load(File.open(ARGV.pop)).each do |path,data|
    # carbon uses . as seperator
    path = path.sub(/^\/rrd\/\//,'').gsub('//','.').sub('/','.').sub(/.rrd$/,'')
    data.first.last.values.first.each do |ts,value|
        stats << "#{path} #{value} #{now}\n"
    end
end

# Stolen from Logstash graphite output
require "socket"
socket = TCPSocket.new(host, port)
socket.puts(stats)
socket.close