protected ExternalMetrics _gatherMetrics(long creationTime, boolean fullStats)
{
ExternalMetrics metrics = new ExternalMetrics(creationTime);
StoreBackend entries = _entryStore.getBackend();
BackendStatsConfig conf = BACKEND_STATS_CONFIG
.onlyCollectFast(!fullStats);
metrics.stores.entries = _clean(entries.getEntryCount(), entries.getEntryStatistics(conf));
metrics.stores.entryIndex = _clean(entries.getIndexedCount(), entries.getIndexStatistics(conf));
if (_lastAccessStore != null) {
metrics.stores.lastAccessStore = _clean(_lastAccessStore.getEntryCount(), _lastAccessStore.getEntryStatistics(conf));