The need for web app health monitoring has become increasingly important as web applications have become more complex over the years. To address this, companies are using various tools like New Relic, Pingdom, and Nagios to monitor their web application's performance. However, these tools often provide specific details that are not ideal for customers or developers who need high-level information about the application's health. This is where automated user experience monitoring comes in, which involves measuring everything and providing quantitative measures of the experience for users. By combining development and QA teams' efforts, companies can collect information from both sides and analyze it to provide a complete picture that's usable by the whole team. Automated tests written by testers are used to monitor the end-user experience, while tools managed by developers and systems teams provide back-end information. The challenging part of monitoring is coverage and run frequency, but with over 1500 automated tests running daily, Postmark has found a balance between these aspects.