@Override
    public String toString() {
        return "SelectionSummary{" +
                "itemCount=" + itemCount +
                ", feedCount=" + feedCount +
                ", distinctFeeds=" + distinctFeeds +
                ", typeCount=" + typeCount +
                ", distinctTypes=" + distinctTypes +
                ", processorCount=" + processorCount +
                ", pipelineCount=" + pipelineCount +
                ", statusCount=" + statusCount +
                ", ageRange=" + ageRange +
                '}';
    }
@return Set of status affected. May have been truncated if too many.
compare {@link SelectionSummary#getStatusCount()} against the size of this set to
establish if truncation has happened.
stroom-core-shared/src/main/java/stroom/meta/shared/SelectionSummary.java