Find unattached nrsysmond instances.

find_unattached_nrsysmond.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'rest_client'
require 'json'

banner = <<-EOS
Report all New Relic applications that do not have the system monitor 
daemon reporting into the given application environment.

  Usage:
      find_unattached_nrsysmond.rb <API-KEY>

Example:

      find_unattached_nrsysmond.rb 1234567890abcdef

EOS

endpoint = 'https://api.newrelic.com'

if ARGV.length != 1
  puts banner
  exit 1
else
  api_key = ARGV[0]
end

response = nil
begin
  response = RestClient.get "#{endpoint}/v2/applications.json", 'X-Api-Key' => api_key
rescue => e
  puts "ERROR: Cannot connect to #{endpoint} : #{e.response}"
  exit 1
end

nr_data = JSON.parse(response)

nr_data['applications'].each do |app|
  app_data = JSON.parse(RestClient.get "#{endpoint}/v2/applications/#{app['id']}/instances.json", 'X-Api-Key' => api_key)
  app_instances = app_data['application_instances'].first
  # Some app instances have no applications at all. Empty environments
  # so check for that before trying to find a linked server
  if app_instances && !app_instances['links']['server']
    puts "#{app_instances['application_name']} has no linked nrsysmond"
  end
end