我有一个使用webclient调用另一个微服务（子服务）的父服务。

public Mono<Product> productFromIntegrator() {

        String url = "http://localhost:8282/product";

    return Mono.deferContextual(contextView -> {
        try (ContextSnapshot.Scope scope = ContextSnapshot.setThreadLocalsFrom(contextView,
                ObservationThreadLocalAccessor.KEY)) {
            LOG.info("<ACCEPTANCE_TEST> <TRACE:{}> Hello from producer", tracer.currentSpan().context().traceId());
            LOG.info("Service Called");
            return webClient.get().uri(url)
                    .retrieve().bodyToMono(Product.class).log(LOG.getName(), Level.FINE)
                    .onErrorMap(WebClientException.class, ex -> {
                        LOG.warn("Error retrieving Product");
                        return ex;
                    });
        }
    });
}

来自子级的RestController：

@Autowired
private final Service service;
private final Tracer tracer;

public Controller(Service service, Tracer tracer) {
    this.service = service;
    this.tracer = tracer;
}

@GetMapping(value = "/product")
public Mono<Product> getProduct() {

    return Mono.deferContextual(contextView -> {
        try (ContextSnapshot.Scope scope = ContextSnapshot.setThreadLocalsFrom(contextView,
                ObservationThreadLocalAccessor.KEY)) {
            LOG.info("<ACCEPTANCE_TEST> <TRACE:{}> Hello from producer", tracer.currentSpan().context().traceId());
            LOG.info("Service Called");
            return this.service.getProduct();
        }
    });
}

子级未从父级获取TraceId，它正在创建新的观察对象。关于如何将TraceId从父级传播到子级，有何建议/示例？