@GrpcGlobalClientInterceptor
    @Order(InterceptorOrder.ORDER_TRACING_METRICS + 1)
    ClientInterceptor globalObservationClientInterceptorConfigurer(final ObservationRegistry observations) {
        return new ObservationGrpcClientInterceptor(observations);
    }
Configures a global client interceptor that applies micrometer tracing logic to the requests.

@param observations The observation registry bean.
@return The tracing client interceptor bean.
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/autoconfigure/GrpcClientMicrometerTraceAutoConfiguration.java