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