Adding Custom "trace id with Alpha numeric values and spiting it out in application Log "

Question

I am using Sleuth 2.1.3. I want to add a custom "trace ID" as "correlation id" with alpha numeric value and want to spit in logs with spanid and parent id. If i use below implementation for creating new custom trace id. does it get printed in logs ?

I tried below implementation but does not see any custom trace in log https://github.com/openzipkin/zipkin-aws/blob/release-0.11.2/brave-propagation-aws/src/main/java/brave/propagation/aws/AWSPropagation.java

Tracing.newBuilder().propagationFactory(
  ExtraFieldPropagation.newFactoryBuilder(B3Propagation.FACTORY)
                       .addField("x-vcap-request-id")
                       .addPrefixedFields("x-baggage-", Arrays.asList("country-code", "user-id"))
                       .build()
);

I tried with above code from https://cloud.spring.io/spring-cloud-sleuth/reference/html/#propagation but didnt see any custom trace id in log

Answer 1

You've passed in the B3Propagation.FACTORY as the implementation of the propagation factory so you're explicitly stating that you want the default B3 headers. You've said that you want some other field that is alphanumeric to be also propagated. Then in a log parsing tool you can define that you want to use your custom field as the trace id, but it doesn't mean that the deafult X-B3-TraceId field will be changed. If you want to use your custom field as trace id that Sleuth understands, you need to change the logging format and implement a different propagation factory bean.