Sample project for demonstrating an issue with Spring Cloud Gateway logs missing Sleuth trace data.

• To build: mvn clean verify
• To run: mvn spring-boot:run
• To test: curl http://localhost:8080/foo
• Response will be an error, but the server's log messages for the request will be similar to: ... [traceId=] [spanId=] - ..."
• If you revert to previous release of Spring/SpringCloud:

		<version.spring>5.2.9.RELEASE</version.spring>
		<version.spring.boot>2.3.4.RELEASE</version.spring.boot>
		<version.spring.cloud.release.train>Hoxton.SR8</version.spring.cloud.release.train>
		<version.reactor.release.train>Dysprosium-SR12</version.reactor.release.train>

• Log messages for the request will be similar to: [traceId=157b5667cef9ead0] [spanId=157b5667cef9ead0] ..."

(Not a contribution)