diff --git a/pkg/prom/db_stats_collector.go b/pkg/prom/db_stats_collector.go
index 738f60d..3dc1223 100644
--- a/pkg/prom/db_stats_collector.go
+++ b/pkg/prom/db_stats_collector.go
@@ -23,7 +23,7 @@ import (
 )
 
 const (
-	namespace = "eth-statediff-service"
+	namespace = "eth_statediff_service"
 	subsystem = "connections"
 )
 
diff --git a/pkg/prom/prom.go b/pkg/prom/prom.go
index dee6167..61f5a8a 100644
--- a/pkg/prom/prom.go
+++ b/pkg/prom/prom.go
@@ -38,43 +38,52 @@ var (
 	tTxCommit        prometheus.Histogram
 )
 
+const (
+	LOADED_HEIGHT        = "loaded_height"
+	PROCESSED_HEIGHT     = "processed_height"
+	T_BLOCK_LOAD         = "t_block_load"
+	T_BLOCK_PROCESSING   = "t_block_processing"
+	T_STATE_PROCESSING   = "t_state_processing"
+	T_POSTGRES_TX_COMMIT = "t_postgres_tx_commit"
+)
+
 // Init module initialization
 func Init() {
 	metrics = true
 
 	lastLoadedHeight = promauto.NewGauge(prometheus.GaugeOpts{
 		Namespace: namespace,
-		Name:      "loaded_height",
+		Name:      LOADED_HEIGHT,
 		Help:      "The last block that was loaded for processing",
 	})
 	lastProcessedHeight = promauto.NewGauge(prometheus.GaugeOpts{
 		Namespace: namespace,
-		Name:      "processed_height",
+		Name:      PROCESSED_HEIGHT,
 		Help:      "The last block that was processed",
 	})
 
 	tBlockLoad = promauto.NewHistogram(prometheus.HistogramOpts{
 		Namespace: namespace,
 		Subsystem: statsSubsystem,
-		Name:      "t_block_load",
+		Name:      T_BLOCK_LOAD,
 		Help:      "Block loading time",
 	})
 	tBlockProcessing = promauto.NewHistogram(prometheus.HistogramOpts{
 		Namespace: namespace,
 		Subsystem: statsSubsystem,
-		Name:      "t_block_processing",
+		Name:      T_BLOCK_PROCESSING,
 		Help:      "Block (header, uncles, txs, rcts, tx trie, rct trie) processing time",
 	})
 	tStateProcessing = promauto.NewHistogram(prometheus.HistogramOpts{
 		Namespace: namespace,
 		Subsystem: statsSubsystem,
-		Name:      "t_state_processing",
+		Name:      T_STATE_PROCESSING,
 		Help:      "State (state trie, storage tries, and code) processing time",
 	})
 	tTxCommit = promauto.NewHistogram(prometheus.HistogramOpts{
 		Namespace: namespace,
 		Subsystem: statsSubsystem,
-		Name:      "t_postgres_tx_commit",
+		Name:      T_POSTGRES_TX_COMMIT,
 		Help:      "Postgres tx commit time",
 	})
 }
@@ -107,13 +116,13 @@ func SetTimeMetric(name string, t time.Duration) {
 	}
 	tAsF64 := t.Seconds()
 	switch name {
-	case "t_block_load":
+	case T_BLOCK_LOAD:
 		tBlockLoad.Observe(tAsF64)
-	case "t_block_processing":
+	case T_BLOCK_PROCESSING:
 		tBlockProcessing.Observe(tAsF64)
-	case "t_state_processing":
+	case T_STATE_PROCESSING:
 		tStateProcessing.Observe(tAsF64)
-	case "t_postgres_tx_commit":
+	case T_POSTGRES_TX_COMMIT:
 		tTxCommit.Observe(tAsF64)
 	}
 }
diff --git a/pkg/service.go b/pkg/service.go
index 00f02dd..360b936 100644
--- a/pkg/service.go
+++ b/pkg/service.go
@@ -309,7 +309,7 @@ func (sds *Service) writeStateDiff(block *types.Block, parentRoot common.Hash, p
 	}
 	height := block.Number().Int64()
 	prom.SetLastLoadedHeight(height)
-	prom.SetTimeMetric("t_block_load", time.Now().Sub(t))
+	prom.SetTimeMetric(prom.T_BLOCK_LOAD, time.Now().Sub(t))
 	t = time.Now()
 	tx, err := sds.indexer.PushBlock(block, receipts, totalDifficulty)
 	if err != nil {
@@ -322,16 +322,16 @@ func (sds *Service) writeStateDiff(block *types.Block, parentRoot common.Hash, p
 	codeOutput := func(c sdtypes.CodeAndCodeHash) error {
 		return sds.indexer.PushCodeAndCodeHash(tx, c)
 	}
-	prom.SetTimeMetric("t_block_processing", time.Now().Sub(t))
+	prom.SetTimeMetric(prom.T_BLOCK_PROCESSING, time.Now().Sub(t))
 	t = time.Now()
 	err = sds.Builder.WriteStateDiffObject(sd.StateRoots{
 		NewStateRoot: block.Root(),
 		OldStateRoot: parentRoot,
 	}, params, output, codeOutput)
-	prom.SetTimeMetric("t_state_processing", time.Now().Sub(t))
+	prom.SetTimeMetric(prom.T_STATE_PROCESSING, time.Now().Sub(t))
 	t = time.Now()
 	err = tx.Close(err)
 	prom.SetLastProcessedHeight(height)
-	prom.SetTimeMetric("t_postgres_tx_commit", time.Now().Sub(t))
+	prom.SetTimeMetric(prom.T_POSTGRES_TX_COMMIT, time.Now().Sub(t))
 	return err
 }