public static Span newClientSpan(String serviceNameSuffix) {
    return spanBuilder(serviceNameSuffix).kind(CLIENT)
      .remoteEndpoint(BACKEND.toBuilder().serviceName("backend" + serviceNameSuffix).build())
      .name("get /foo")
      .clearTags()
      .putTag("http.method", "GET")
      .putTag("http.path", "/foo")
      .build();
  }
Zipkin trace ids are random 64bit numbers. This creates a relatively large input to avoid
flaking out due to PRNG nuance.
zipkin-tests/src/main/java/zipkin2/TestObjects.java