What is happening with my microservices?: In the era of microservices, cloud-native applications, and complex infrastructure, understanding the health and performance of our systems is both more challenging and crucial than ever. Observability, distinct from mere monitoring, provides insights into the internal states of systems based on their external outputs. This talk will introduce the core principles of observability, delineate its significance in modern software engineering, and offer a primer on key tools and practices. By harnessing the power of observability, engineers can proactively identify issues, optimize performance, and ensure that their systems are resilient and user-centric.