simple fact to report stats from last puppet run as a fact

puppet_report.rb

Facter.add(:puppet_report) do
  setcode do
    report         = YAML.load_file(Puppet.settings['lastrunreport'])
    all_changes    = report.resource_statuses.select { |title, rsc| rsc.changed }
    config_changes = all_changes.select { |title, rsc| rsc.resource_type != 'Notify' }

    {
      :time                  => report.time,
      :configuration_version => report.configuration_version,
      :status                => report.status,
      :success               => (['changed', 'unchanged'].include? report.status),
      :noop                  => report.noop,
      :environment           => report.environment,
      :changes               => all_changes.map { |title, rsc| title },
      :change_count          => all_changes.count,
      :config_changes        => config_changes.map { |title, rsc| title },
      :config_change_count   => config_changes.count,
    }
  end
end

The actual changes are probably not a good idea to keep. They might be REALLY huge.