In a world where serverless architecture promises less management but brings observability challenges, this talk offers a technical deep dive into achieving effective observability. We will explore the principles of observability with a focus on serverless environments, dissecting the importance of high cardinality, semantic conventions, and context propagation. Practical demonstrations with OpenTelemetry will highlight how to instrument your applications for better insight. The session will also critically compare the pros and cons of using cloud provider observability tools versus third-party platforms, taking into account factors such as simplicity, costs, and ongoing maintenance. Whether you're a DevOps engineer or a cloud architect, this talk equips you with the knowledge to optimize your observability strategy.