Observability is a crucial capability for understanding the internal state of large-scale infrastructure systems by examining their external outputs, providing a lens to monitor, analyze, and troubleshoot various components. Large-scale infrastructure systems are complex and challenging to manage due to issues that can arise from anywhere, making complexity the enemy of stability. Observability tools can help pinpoint issues with laser focus, optimize resource utilization through capacity planning, enhance team collaboration by fostering transparency, and integrate into incident response strategies for turning chaos into order. The New Relic comprehensive solution offers flexible, dynamic observability of entire infrastructure, including cloud-based solutions, and provides a wide range of infrastructure monitoring capabilities, automation tools, and best practices to master observability. Observability is particularly important in microservices infrastructure, where it provides granular insights into each service, making it easier to monitor, troubleshoot, and optimize them individually and as part of the larger system. By implementing observability strategies, organizations can reduce complexity, make informed decisions about scaling, and improve overall management of large-scale infrastructure systems.