Spring Cloud Sleuth3.1.9

Spring Cloud Sleuth’s last minor version is 3.1. You can check the 3.1.x branch for the latest commits. The core of this project got moved to Micrometer Tracing project and the instrumentations will be moved to Micrometer and all respective projects (no longer all instrumentations will be done in a single repository).


Spring Cloud Sleuth provides Spring Boot auto-configuration for distributed tracing.


Sleuth configures everything you need to get started. This includes where trace data (spans) are reported to, how many traces to keep (sampling), if remote fields (baggage) are sent, and which libraries are traced.

Specifically, Spring Cloud Sleuth…​

  • Adds trace and span ids to the Slf4J MDC, so you can extract all the logs from a given trace or span in a log aggregator.

  • Instruments common ingress and egress points from Spring applications (servlet filter, rest template, scheduled actions, message channels, feign client).

  • If spring-cloud-sleuth-zipkin is available then the app will generate and report Zipkin-compatible traces via HTTP. By default it sends them to a Zipkin collector service on localhost (port 9411). Configure the location of the service using spring.zipkin.baseUrl.

Spring Boot Config

Add Sleuth to your classpath:




buildscript {
    dependencies {
        classpath "io.spring.gradle:dependency-management-plugin:0.5.2.RELEASE"

apply plugin: "io.spring.dependency-management"

dependencyManagement {
     imports {
          mavenBom "org.springframework.cloud:spring-cloud-dependencies:${releaseTrainVersion}"
dependencies {
    compile 'org.springframework.cloud:spring-cloud-starter-sleuth'

As long as Spring Cloud Sleuth is on the classpath any Spring Boot application will generate trace data:

public class Application {

  private static Logger log = LoggerFactory.getLogger(DemoController.class);

  public String home() {
    log.info("Handling home");
    return "Hello World";

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);


Run this app and then hit the home page. You will see traceId and spanId populated in the logs. If this app calls out to another one (e.g. with RestTemplate) it will send the trace data in headers and if the receiver is another Sleuth app you will see the trace continue there.

  • Instead of logging the request in the handler explicitly, you could set logging.level.org.springframework.web.servlet.DispatcherServlet=DEBUG

  • Sleuth defaults to a rate limited sampler. That means that it will sample up to 1000 transactions per second.

  • Set spring.application.name=bar (for instance) to see the service name as well as the trace and span ids.

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