@Override
    public UsageHistogramBean getUsage(String organizationId, String apiId, String version,
            HistogramIntervalType interval, DateTime from, DateTime to) {
        UsageHistogramBean rval = new UsageHistogramBean();
        return rval;
    }
@see io.apiman.manager.api.core.IMetricsAccessor#getUsage(java.lang.String, java.lang.String, java.lang.String, io.apiman.manager.api.beans.metrics.HistogramIntervalType, java.util.Date, java.util.Date)
manager/api/core/src/main/java/io/apiman/manager/api/core/noop/NoOpMetricsAccessor.java