Grafana Faro and xk6-browser, part of the Grafana Labs open-source ecosystem, are innovative tools designed to enhance frontend observability and performance testing. Faro offers a customizable SDK for web app instrumentation, enabling the capture of observability signals that can be integrated with backend and infrastructure data. Released in November 2021, xk6-browser utilizes browser-level APIs to gather frontend performance metrics for Grafana k6 tests. These tools collectively provide insights into the health of frontend applications by addressing the importance of browser instrumentation in capturing metrics, logs, and traces that backend monitoring might miss. The episode discussed their integration, showcasing how browser-based monitoring complements performance testing, and highlighted a demo using the Webshop application to illustrate how these tools work together. Despite some challenges in aligning metrics and API maturity, the tools demonstrate significant potential in identifying browser-level errors and improving user experience. The discussion also emphasized the importance of distributed tracing and hybrid approaches to performance testing, underscoring the synergy between Grafana and k6 for comprehensive observability.