This post is a part of a series: The Basics The bumpy road of Spring Cloud Sleuth Unified Bridging between Reactive and Imperative Spring Cloud Sleuth recently became Micrometer Tracing, part of the Micrometer project. Most of the tracing instrumentation is centered within Micrometer under the new Observability API. The goal of these projects is to enable observability of any application – in the form of metrics, tracing, and logs that contain correlation identifiers.