it’s enough for you to register beans of types:We instrument the Zuul Ribbon integration by enriching the Ribbon requests with tracing information. When a span is not sampled, it adds no overhead (a noop).Sampling is an up-front decision, meaning that the decision to report data is made at the first operation in a trace and that decision is propagated downstream.By default, a global sampler applies a single rate to all traced operations. not added spans by default, which means you can’t search based on Baggage Spring Cloud Sleuth understands that a header is baggage-related if the HTTP header is prefixed with The following example shows setting baggage on a span:Baggage travels with the trace (every child span contains the baggage of its parent). To do so, provide a comma-separated list of regular expressions in the Features from this section can be disabled by setting the By default, all the spring boot actuator endpoints are automatically added to the skip pattern. This doesn’t start new traces for requests to the health check service. The next two examples show how that might work for a client and a server.The following example shows how client-side propagation might work:The following example shows how server-side propagation might work:Sometimes you need to propagate extra fields, such as a request ID or an alternate trace context. You can add request headers by configuring You can do the following operations on the Span by means of In the preceding example, we could see how to create a new instance of the span. intercepts production requests to gather timing data, correlate and propagate
The following example shows how that might work internally:Depending on what the operation is, you may want to apply different policies. However, you can search by tag to find the trace, assuming a span having the searched tag value exists.If you want to be able to lookup a span based on baggage, you should add a corresponding entry as a tag in the root span.The following listing shows integration tests that use baggage:This section addresses how to add Sleuth to your project with either Maven or Gradle.If you want to use only Spring Cloud Sleuth without the Zipkin integration, add the The following example shows how to add Sleuth with Maven:The following example shows how to add Sleuth with Gradle:The following example shows how to do so for Maven:The following example shows how to do so for Gradle:If you want to use RabbitMQ or Kafka instead of HTTP, add the The following example shows how to do so for Gradle:Spring Cloud Sleuth supports sending traces to multiple tracing systems as of version 2.1.0. it’s enough for you to register beans of types:We instrument quartz jobs by adding Job/Trigger listeners to the Quartz Scheduler.For projects depending on Project Reactor such as Spring Cloud Gateway, we suggest turning the Sleuth configures the logging context with variables including the service name And for this writeup we're going to focus on using Sleuth in a monolith application, not across microservices. Sampling is a way to prevent overloading the system, by consistently tracing some, but All of this is explained later in this document.That said, you might want to know more about how things work underneath. In our sample, the tag key is If you want to add tags and annotations to an existing span, you can use the There are 3 different ways to add tags to a span. Paste that into Zipkin to visualize the entire trace, regardless of This utility is used in standard instrumentation (such as A normal instrumentation pattern is to create a span representing the server side of an RPC. configures where trace data (spans) are reported to, how many traces to keep If a customization of producer / consumer sampling of messaging traces is required, Brave typically Trace IDs appear in logs regardless of Let’s focus on the latter. * [Brave’s core library](Sampling only applies to tracing backends, such as Zipkin. In this case, the value of the annotated method’s parameter runtime value becomes the value of the tag.
Without this feature, you must use the span api, which has lifecycle commands that could be used incorrectly. Sleuth also adds annotation based tracing features and some instrumentation not We search for a If we do not find any expression to evaluate, return the The value of the tag for the following method is computed by an implementation of The two preceding examples lead to setting a tag value equal to RpcTracingCustomizer - for RPC tagging and sampling policyHttpTracingCustomizer - for HTTP tagging and sampling policyMessagingTracingCustomizer - for messaging tagging and sampling policyCurrentTraceContextCustomizer - to integrate decorators such as correlation.BaggagePropagationCustomizer - for propagating baggage fields in process and over headersCorrelationScopeDecoratorCustomizer - for scope decorations such as MDC (logging) field correlationThe default span data policy for HTTP requests is described in Brave: