Munin plugin to monitor/alert about the last Puppet run

puppet_status.rb

#!/usr/bin/env ruby

require 'yaml'
require 'puppet'

if ARGV[0] == 'config'
  puts <<END
graph_args --base 1000 -l 0 -M
graph_vlabel value
graph_title Puppet stats
graph_category system
graph_info This graph shows Puppet statistics
graph_order status lastrun runtime res_total res_skipped res_failed res_failed_to_restart res_restarted res_changed res_out_of_sync res_scheduled
status.label Status
lastrun.label Last Run
runtime.label Run Time
res_total.label Resources
res_skipped.label Skipped
res_failed.label Failed
res_failed_to_restart.label Failed to Restart
res_restarted.label Restarted
res_changed.label Changed
res_out_of_sync.label Out of Sync
res_scheduled.label Scheduled
status.warning 1
status.critical 2
lastrun.warning 3600
lastrun.critical 36000
runtime.warning 20
runtime.critical 60
END
  for i in ['status', 'lastrun', 'runtime', 'res_total']
    puts "#{i}.min 0"
    puts "#{i}.draw LINE2"
  end
  for i in ['res_skipped', 'res_restarted', 'res_changed', 'res_out_of_sync']
    puts "#{i}.min 0"
    puts "#{i}.draw AREASTACK"
    puts "#{i}.warning 1"
    puts "#{i}.critical 10"
  end
  for i in ['res_scheduled']
    puts "#{i}.min 0"
    puts "#{i}.draw AREASTACK"
  end
  for i in ['res_failed', 'res_failed_to_restart']
    puts "#{i}.min 0"
    puts "#{i}.draw AREASTACK"
    puts "#{i}.critical 1"
  end
  exit
end

report = YAML.load_file('/var/lib/puppet/state/last_run_report.yaml')

if (report.status == 'unchanged')
  puts 'status.value 0'
elsif (report.status == 'failed')
  puts 'status.value 2'
else
  puts 'status.value 1'
end

puts 'lastrun.value %i' % (Time.now.to_i - Time.at(report.time).to_i)

if !report.metrics.empty?
  for met in [ 'total', 'skipped', 'failed', 'failed_to_restart', 'restarted', 'changed', 'out_of_sync', 'scheduled' ]
    puts "res_#{met}.value #{report.metrics['resources'][met]}"
  end
  puts "runtime.value #{report.metrics['time']['total']}"
end