Explore techniques for investigating failures in distributed systems through this insightful conference talk from NDC Oslo 2023. Dive into the challenges of debugging across multiple services and learn how to regain visibility in complex architectures. Discover modeling techniques, integration testing strategies, and gain a deep understanding of instrumentation using OpenTelemetry. Acquire practical skills for enhancing system observability, applicable to both message-based and other architectural styles. Walk away with concrete takeaways to improve your ability to diagnose and resolve issues in distributed environments.