In this talk, Ryota Sawada from Upsider delves into the intricacies of multi-cluster observability within Service Mesh, focusing on challenges and solutions. He provides a comprehensive introduction to the topic, sharing insights from his experience at Upsider, a fintech startup with extensive multi-cloud and multi-cluster systems. The presentation includes a detailed walkthrough of Service Mesh's standard setup, its role in observability, and the complexities of managing metrics across multiple clusters. Through a live demo, Ryota demonstrates the configuration and deployment of a multi-cluster observability system using tools like Istio, Prometheus, and Thanos. He emphasizes the need for a unified observability approach and provides additional resources for further exploration.