This talk will introduce the new Android Jetpack Multiplatform Tracing Library and take a peek under the hood into its implementation. This session is a deep dive into how that "zero-cost" constraint forged every aspect of the library. We will understand how this goal is achieved, and explore how the API design itself is shaped by the need to avoid allocations, and other additional overhead. The talk also explores the most interesting/complex part of modern tracing: the asynchronous world. We'll explore the mechanics of tracing a single logical operation that hops across multiple threads using coroutines via coroutine context propagation; giving you a complete, unified picture of your code.