public static void appendElapsedAndSize(
            StringBuilder buf, long startTimeNanos, long endTimeNanos, long size) {
        appendElapsed(buf, startTimeNanos, endTimeNanos);
        buf.append(", ");
        appendSize(buf, size);
    }
A shortcut method that calls {@link #appendElapsed(StringBuilder, long, long)} and
{@link #appendSize(StringBuilder, long)}, concatenated by {@code ", "}.
core/src/main/java/com/linecorp/armeria/common/util/TextFormatter.java