public static String formatMetricByteSizeString(final Long streamSize,
                                                    final boolean stripTrailingZeros) {
        if (streamSize == null) {
            return "";
        }
        return formatNumberString(streamSize, METRIC_BYTE_SIZE_DIVIDER, stripTrailingZeros);
    }
Return nice string like "25 B", "4 kB", "45 MB", etc.
stroom-util-shared/src/main/java/stroom/util/shared/ModelStringUtil.java