public static <T> String toPaddedMultiLine(final String padding,
                                               final Collection<T> items) {
        return toPaddedMultiLine(padding, items, Objects::toString);
    }
Output the value with its percentage of {@code total}, e.g. {@code 1000 (10%)}.
Supports numbers and {@link Duration} and {@link DurationAdder}.
stroom-util/src/main/java/stroom/util/logging/LogUtil.java