自分で管理しているサービスのレスポンスタイムを計測し，設定時間以上に遅い場合には，アラートメールを飛ばすスクリプト http://blog.ayakix.com/2013/06/google-apps-script.html

ResponseTimeChecker.js

var BASE_URL      = "http://hogefuga.com";
var DEFAULT_LIMIT = 200;
var MAIL_ADDRESS  = "[email protected]";
var checkApiMap = {
  '/api1' : DEFAULT_LIMIT,
  '/api2' : DEFAULT_LIMIT,
  '/api3' : 300,
}

function sendMail(overApiMap) {
  var title = "#alert some api exceed the limit response time"
  var msg = ""
  for (var api in overApiMap) {
    msg += api + "\t" + overApiMap[api] + "\n"
  }
  if (msg != "") {
    MailApp.sendEmail(MAIL_ADDRESS, title, msg);
  }
}

function doCheck() {
  var overApiMap = {};
  for (var api in checkApiMap) {
    var url    = BASE_URL + api
    var before = new Date();
    var res    = UrlFetchApp.fetch(url);
    var after  = new Date();

    var responseTime = after - before;
    if (res.getResponseCode() !== 200) {
      overApiMap[api] = -1;
    } else if (responseTime > checkApiMap[api]){
      overApiMap[api] = responseTime;
    }
  }
  sendMail(overApiMap);
}