Explore the challenges and solutions for monitoring reactive applications in this 43-minute conference talk from Scala Days Berlin 2016. Delve into the evolution of internet applications towards responsive, scalable, and resilient systems built on event-driven foundations. Examine why traditional stack frame-based monitoring tools fall short for asynchronous, message-driven applications. Discover new approaches for effective monitoring, including tracing techniques and dynamic configuration. Learn about Lightbend's Reactive Platform, comprising Play Framework, Akka middleware, and Scala programming language, and how it embraces this new programming paradigm. Gain insights into best practices for monitoring reactive applications and staying ahead of trends in cloud computing architecture.