Google App Script / Telegram bot / Notify if web is inaccessible / Run every 4 hours

gs.js

const     TOKEN = "YOUR-BOT-TOKEN";
let telegramUrl = "https://api.telegram.org/bot" + TOKEN;

// Telegram send message
function tgNotify(txt, to) {
  let      url = telegramUrl + "/sendMessage?parse_mode=Markdown&disable_web_page_preview=true&chat_id=" + to + "&text=" + txt;
  let response = UrlFetchApp.fetch(url);
  //Logger.log(response.getContentText());
}

// Add custom menu
function onOpen() {
  let ui = SpreadsheetApp.getUi();

  ui.createMenu('Extras')
    .addItem('Check website(s)', 'checkWebsite')
    .addToUi();
}

// This will run the script every 4 hours
function setCheckWebsiteAvailability() {
  ScriptApp.newTrigger('checkWebsite').timeBased().everyHours(4).create();
}

// Check if the website is available
function checkWebsite() {
  // Get the active spreadsheet
  let     sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();

  // Get the range of website URLs and response status
  let dataRange = sheet.getDataRange();
  let    values = dataRange.getValues();

  // Loop through each row in the range
  for (var i = 1; i < values.length; i++) {
    let        row = values[i];
    let websiteUrl = row[0];

    try {
      // Use the UrlFetchApp service to fetch the website
      let     response = UrlFetchApp.fetch(websiteUrl,{ muteHttpExceptions: true });
      var responseCode = response.getResponseCode();
    }
    catch (e) {
      //Logger.log(e);
      responseCode = 504;
    }

    // If the response code is greater than or equals to 400, the website is down
    if (responseCode >= 400) {
      // Notify
      let txt = "⚠️ " + row[0] + " is *inaccessible*!";
      tgNotify(txt, row[3]);
    }

    // Update the response status in the spreadsheet
    sheet.getRange(i+1, 2).setValue(responseCode);

    const now = new Date();
    sheet.getRange(i+1, 3).setValue(now);
  }
}