@Override
        public long startTimestamp() {
            final RequestLogAccess logAccess = ctx.log();
            final RequestLog requestLog = logAccess.getIfAvailable(RequestLogProperty.REQUEST_START_TIME);
            return requestLog != null ? requestLog.requestStartTimeMicros() : 0;
        }
Wraps a pair of {@link ClientRequestContext} and {@link RequestHeadersBuilder} in an {@link
brave.http.HttpClientRequest}.
brave/brave6/src/main/java/com/linecorp/armeria/client/brave/ClientRequestContextAdapter.java