Use both B3 and W3C trace formats in trace propagation between Spring Boot 2 & 3 applications – Spring

management:
  tracing:
    propagation:
      consume: [b3, w3c]
      produce: [b3, w3c]

The Solutions:

Solution 1: Using application.yml

Configure both B3 and W3C formats in Spring Boot 3 applications using the `application.yml` file. Set the `consume` and `produce` properties to include both formats, as shown below:
“`yaml
management:
tracing:
propagation:
consume: [b3, w3c]
produce: [b3, w3c]
“`

This allows Spring Boot 3 services to recognize and propagate both formats, ensuring compatibility with both Spring Boot 2 and 3 applications.

Solution 2: Custom Interceptor Propagation

In Spring Boot 3, multiple propagation formats are not supported. However, you can use a custom interceptor to propagate both B3 and W3C trace formats in between Spring Boot 2 and 3 applications.

To do this, you can implement an interceptor that intercepts the outgoing requests and adds both B3 and W3C trace headers to the request.