@Override
    public SortedMap<String, Histogram> getHistograms(MetricFilter filter) {
        return getMetrics(Histogram.class, filter);
    }
@ Override public SortedMap < String , Histogram > getHistograms ( MetricFilter filter ) { return getMetrics ( Histogram . class , filter ) ; }
Returns a map of all the histograms in the registry and their names which match the given
filter.

@param filter the metric filter to match
@return all the histograms in the registry