Spring Boot modifies the logger format to contain application name, trace and span ids.
$ curl -H "TraceParent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01" localhost:8080
Hello World
logs:
2023-12-15T11:17:33.962Z DEBUG 2135673 --- [demo] [nio-8080-exec-3] [4bf92f3577b34da6a3ce929d0e0e4736-68a712d2681cdba8] o.s.web.servlet.DispatcherServlet : GET "/", parameters={}
2023-12-15T11:17:33.963Z DEBUG 2135673 --- [demo] [nio-8080-exec-3] [4bf92f3577b34da6a3ce929d0e0e4736-68a712d2681cdba8] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to com.example.demo.DemoController#hello()
2023-12-15T11:17:33.963Z DEBUG 2135673 --- [demo] [nio-8080-exec-3] [4bf92f3577b34da6a3ce929d0e0e4736-68a712d2681cdba8] m.m.a.RequestResponseBodyMethodProcessor : Using 'text/plain', given [*/*] and supported [text/plain, */*, application/json, application/*+json]
2023-12-15T11:17:33.963Z DEBUG 2135673 --- [demo] [nio-8080-exec-3] [4bf92f3577b34da6a3ce929d0e0e4736-68a712d2681cdba8] m.m.a.RequestResponseBodyMethodProcessor : Writing ["Hello World"]
2023-12-15T11:17:33.964Z DEBUG 2135673 --- [demo] [nio-8080-exec-3] [4bf92f3577b34da6a3ce929d0e0e4736-68a712d2681cdba8] o.s.web.servlet.DispatcherServlet : Completed 200 OK
(See otel docs for syntax of the header.)