public static StringBuilder elapsedAndSize(long startTimeNanos, long endTimeNanos, long size) {
        final StringBuilder buf = new StringBuilder(16);
        appendElapsedAndSize(buf, startTimeNanos, endTimeNanos, size);
        return buf;
    }
Similar to {@link #appendElapsedAndSize(StringBuilder, long, long, long)} except that this method
creates a new {@link StringBuilder}.
core/src/main/java/com/linecorp/armeria/common/util/TextFormatter.java