One of the biggest challenges of working with distributed systems (even small ones with only 10 services) is maintaining them once they're live and performing triage of major issues and returning systems back to health as quickly as possible. This creates a key need for a good developer experience with complex systems: how to minimize the amount of time spent awake at 2am in order to achieve Return To Service. Having a good experience for developers is founded upon how the distributed system is built and developing specific problem solving strategies. For example, using technical tools (such as distributed tracing techniques) strategically to understand how a system is currently behaving and quickly identify what is misbehaving. This talk will cover the technical tools you need to gain information on a complex system and practical approaches to convert that information into an actual understanding of the system.