list.each { |file|
        content = YAML.parse_file file.chomp
        # failed count
        count = 0
        while content['metrics']['resources']['values'][count]
            if content['metrics']['resources']['values'][count][0].value == ":failed"
                report[server][0] += content['metrics']['resources']['values'][count][2].value.to_i
                break
            end
            count += 1
        end
        # changes count
        report[server][1] += content['metrics']['changes']['values'][0][2].value.to_i
        if report[server][1] > 0
            i = "#{report[server][0].class}" == "Array" ? report[server][i].length : 2
            content['logs'].value.each { |yaml_obj|
                report[server][i] = Array.new
                report[server][i][0] = yaml_obj['source'].value
                report[server][i][1] = yaml_obj['message'].value
                report[server][i][2] = yaml_obj['time'].value