As per VryAz said , you may use Web Application Availability Monitoring or The Web Application Transaction Monitoring. However, there is some different between this two templates.
Web Application Availability Monitoring template lets you create availability monitoring tests for one or more web application URLs and run these monitoring tests from internal locations.Use the Web Application Availability Monitoring template in scenarios where you have to monitor web-based applications from different locations to see if they are working according to certain requirements. Web Application availability Monitoring provides a fruitful performance data such as Transaction response time, Response time,TCP connect time,Time to first byte etc
The Web Application Transaction Monitoring template lets you test a website or web-based application by sending requests over HTTP, validating their response, and measuring their performance.The website can be external site.It an be a complex set of requests to simulate a user who is performing such actions as logging on to the site and browsing through a set of pages.
So I suggests you use Web Application Availability Monitoring in your case.
Roger