diff --git a/trie/triedb/pathdb/metrics.go b/trie/triedb/pathdb/metrics.go
index ee91e5dc20..deffa788fd 100644
--- a/trie/triedb/pathdb/metrics.go
+++ b/trie/triedb/pathdb/metrics.go
@@ -61,4 +61,12 @@ var (
 	baseNodeBufferDifflayerAvgSize = metrics.NewRegisteredGauge("pathdb/basenodebuffer/difflayeravgsize", nil)
 	proposedBlockReaderSuccess     = metrics.NewRegisteredMeter("pathdb/nodebufferlist/proposedblockreader/success", nil)
 	proposedBlockReaderMismatch    = metrics.NewRegisteredMeter("pathdb/nodebufferlist/proposedblockreader/mismatch", nil)
+
+	// temp metrics for test purpose
+	nblCountGauge         = metrics.NewRegisteredGauge("pathdb/nbl/count", nil)
+	nblLayersGauge        = metrics.NewRegisteredGauge("pathdb/nbl/layers", nil)
+	nblPersistIDGauge     = metrics.NewRegisteredGauge("pathdb/nbl/persistid", nil)
+	nblPrePersistIDGauge  = metrics.NewRegisteredGauge("pathdb/nbl/prepersistid", nil)
+	nblBaseLayersGauge    = metrics.NewRegisteredGauge("pathdb/nbl/baselayers", nil)
+	nblPreBaseLayersGauge = metrics.NewRegisteredGauge("pathdb/nbl/prebaselayers", nil)
 )
diff --git a/trie/triedb/pathdb/nodebufferlist.go b/trie/triedb/pathdb/nodebufferlist.go
index c66e3916d2..cac36d80bc 100644
--- a/trie/triedb/pathdb/nodebufferlist.go
+++ b/trie/triedb/pathdb/nodebufferlist.go
@@ -281,8 +281,8 @@ func (nf *nodebufferlist) flush(db ethdb.KeyValueStore, clean *fastcache.Cache,
 	}
 	nf.traverseReverse(commitFunc)
 	// delete after testing
-	//prePersistID := nf.persistID
-	//preBaseLayes := nf.base.layers
+	prePersistID := nf.persistID
+	preBaseLayers := nf.base.layers
 	persistID := nf.persistID + nf.base.layers
 	err := nf.base.flush(nf.db, nf.clean, persistID)
 	if err != nil {
@@ -291,6 +291,13 @@ func (nf *nodebufferlist) flush(db ethdb.KeyValueStore, clean *fastcache.Cache,
 	nf.isFlushing.Store(false)
 	nf.base.reset()
 	nf.persistID = persistID
+
+	nblCountGauge.Update(int64(nf.count))
+	nblLayersGauge.Update(int64(nf.layers))
+	nblPersistIDGauge.Update(int64(nf.persistID))
+	nblPrePersistIDGauge.Update(int64(prePersistID))
+	nblBaseLayersGauge.Update(int64(nf.base.layers))
+	nblPreBaseLayersGauge.Update(int64(preBaseLayers))
 	// add metrics, delete after testing
 	// 1. nf.count  nf.layers => Guard type
 	// 2. nf.persistID prePersistID => Guard type