When working in cross-service tracing contexts, I would like to define policies and filters at the ingress service and not have to also set the same url filters on each of the microservices. It would be nice if I could set all but the public trace server to require the header to be set, and then I could rate limit and filter just on the public microservice.

Since the x-cloud-trace-context is used for tracing spans, would a filter based on the header being set or not be easy to add?

https://github.com/googleapis/cloud-trace-nodejs/blob/f8b74e6ec0af23adb531ff48aa18ad1d89703834/doc/trace-api.md#cross-service-trace-contexts