api-dashboard-update.rb

require 'rubygems'
require 'dogapi'

api_key='9775a026f1ca7d1c6c5af9d94d9595a4'
app_key='87ce4a24b5553d2e482ea8a8500e71b8ad4554ff'

dog = Dogapi::Client.new(api_key, app_key)

dash_id = '2551'
title = 'New and Improved Dashboard'
description = 'This has all the new hotness.'
graphs =  [{
  "definition" => {
    "events" => [],
    "requests "=> [
      {"q" => "avg:system.mem.free{*}"}
    ],
  "viz" => "timeseries"
  },
  "title" => "Average Memory Free"
}]

dog.update_dashboard(dash_id, title, description, graphs)