Most observability efforts focus on distributed services and cloud architectures, end-users only care that the client-side works for them. In this talk, we’ll explore how to make client-side web applications more observable by monitoring session analytics, user experience, errors, APIs, and data integrity directly from real users. We’ll cover how web developers, SREs, and DevOps engineers can collect data from the browser, handle noise, and interpret data to make better decisions for users, enabling them to prioritize fixes that have the most impact.