count_dynos.rb

#!/usr/bin/env ruby

require 'ap'
require 'pry'
require 'platform-api'

token = 'c' # Create token as seen at https://github.com/heroku/platform-api#a-real-world-example
heroku = PlatformAPI.connect_oauth(token)
apps = heroku.app.list
app_names = apps.map { |app| app['name'] unless app['name'].include?('-pr-') }.compact
dynos = {}
total_dynos = 0

# organize dynos
app_names.each do |name|
  app_formation = heroku.formation.list(name)
  
  app_formation.each do |formation|
    quantity = formation['quantity']
    next if quantity.zero?
    dyno_size = formation['size']
    formation_id = "#{name}:#{formation['type']}"
    dynos[dyno_size] ||= {}
    dynos[dyno_size][formation_id] = quantity
  end
end

# report on dynos
dynos.each do |k,v| 
  sum = v.values.sum
  total_dynos += sum
  puts "#{sum} #{k}\n"
end

puts "\n#{total_dynos} dynos total\n\n"
ap dynos