Ruby script to query Stackdriver for all instances currently set to Maintenance mode.

stackdriver-maintenance.rb

#!/usr/bin/env ruby
#
require 'net/http'
require 'json'

apiKey       ='APIKEYHERE'
params       = { :apikey => apiKey } 
instances    = {}

counter = 0
Net::HTTP.start('api.stackdriver.com', 443, :use_ssl => true) do |http|
  
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  http.keep_alive_timeout = 10
  
  uri = URI.parse('https://api.stackdriver.com/v0.2/instances')
  uri.query = URI.encode_www_form(params)
  
  #JSON(http.request(Net::HTTP::Get.new(uri.request_uri)).body)['data'].each do |instance|
  JSON(http.request_get(uri.request_uri).body)['data'].each do |instance|
    instanceId      = instance['id']
    maintUri        = URI.parse("https://api.stackdriver.com/v0.2/instances/#{instanceId}/maintenance")
    maintUri.query  = URI.encode_www_form(params)
    
    maintStatus=JSON(http.request_get(maintUri.request_uri).body)['data']
    if maintStatus['maintenance']
      if maintStatus['reason']
        instances["#{instance['name']}"] = { 'maintenance' => maintStatus['maintenance'], 'reason' => maintStatus['reason'] }
      else
        instances["#{instance['name']}"] = { 'maintenance' => maintStatus['maintenance'] }
      end
    end
  end
end

instances.keys.sort.each do |instance|
  if instances[instance]['reason']
    puts "#{instance} is in maintenance mode because: #{instances[instance]['reason']}"
  else
    puts "#{instance} is in maintenance mode for no good reason"
  end
end