@Override
    public ClientUsagePerApiBean getClientUsagePerApi(String organizationId, String clientId,
            String version, DateTime from, DateTime to) {
        ClientUsagePerApiBean rval = new ClientUsagePerApiBean();
        return rval;
    }
@see io.apiman.manager.api.core.IMetricsAccessor#getClientUsagePerApi(java.lang.String, java.lang.String, java.lang.String, org.joda.time.DateTime, org.joda.time.DateTime)
manager/api/core/src/main/java/io/apiman/manager/api/core/noop/NoOpMetricsAccessor.java