public static boolean updateRemoteEndpoint(Span span, RequestContext ctx) {
        final InetSocketAddress remoteAddress = ctx.remoteAddress();
        if (remoteAddress != null) {
            return span.remoteIpAndPort(remoteAddress.getAddress().getHostAddress(), remoteAddress.getPort());
        }
        return false;
    }
Semi-official annotation for the time the first bytes were received on the wire.
brave/brave6/src/main/java/com/linecorp/armeria/internal/common/brave/SpanTags.java