public long getCombinedEntryCount() {
        return getStoresAggregateValue(store ->
                store.getKeyValueEntryCount() + store.getRangeValueEntryCount());
    }
Get all ref stores keyed by feed name

@return Map of feedName => {@link RefDataOffHeapStore}
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/offheapstore/DelegatingRefDataOffHeapStore.java