public static RequestContextCurrentTraceContext ofDefault() {
        return DEFAULT;
    }
Returns the default {@link CurrentTraceContext}. Use this when building a {@link Tracing} instance
for use with {@link BraveService} or {@link BraveClient}.

<p>If you need to customize the context, use {@link #builder()} instead.

@see Tracing.Builder#currentTraceContext(CurrentTraceContext)
brave/brave6/src/main/java/com/linecorp/armeria/common/brave/RequestContextCurrentTraceContext.java