diff --git a/pkg/storage/tsdb/multilevel_cache.go b/pkg/storage/tsdb/multilevel_cache.go
index 11f5f5287a..16689efc18 100644
--- a/pkg/storage/tsdb/multilevel_cache.go
+++ b/pkg/storage/tsdb/multilevel_cache.go
@@ -2,14 +2,13 @@ package tsdb
 
 import (
 	"context"
-	"sync"
-
 	"github.com/oklog/ulid"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/storage"
 	storecache "github.com/thanos-io/thanos/pkg/store/cache"
+	"sync"
 )
 
 const (
@@ -21,7 +20,8 @@ const (
 type multiLevelCache struct {
 	caches []storecache.IndexCache
 
-	fetchLatency *prometheus.HistogramVec
+	fetchLatency    *prometheus.HistogramVec
+	backFillLatency *prometheus.HistogramVec
 }
 
 func (m *multiLevelCache) StorePostings(blockID ulid.ULID, l labels.Label, v []byte, tenant string) {
@@ -66,6 +66,8 @@ func (m *multiLevelCache) FetchMultiPostings(ctx context.Context, blockID ulid.U
 	}
 
 	defer func() {
+		backFillTimer := prometheus.NewTimer(m.backFillLatency.WithLabelValues(cacheTypePostings))
+		defer backFillTimer.ObserveDuration()
 		for cache, hit := range backfillMap {
 			for _, values := range hit {
 				for l, b := range values {
@@ -104,7 +106,9 @@ func (m *multiLevelCache) FetchExpandedPostings(ctx context.Context, blockID uli
 		}
 		if d, h := c.FetchExpandedPostings(ctx, blockID, matchers, tenant); h {
 			if i > 0 {
+				backFillTimer := prometheus.NewTimer(m.backFillLatency.WithLabelValues(cacheTypeExpandedPostings))
 				m.caches[i-1].StoreExpandedPostings(blockID, matchers, d, tenant)
+				backFillTimer.ObserveDuration()
 			}
 			return d, h
 		}
@@ -156,6 +160,8 @@ func (m *multiLevelCache) FetchMultiSeries(ctx context.Context, blockID ulid.ULI
 	}
 
 	defer func() {
+		backFillTimer := prometheus.NewTimer(m.backFillLatency.WithLabelValues(cacheTypeSeries))
+		defer backFillTimer.ObserveDuration()
 		for cache, hit := range backfillMap {
 			for _, values := range hit {
 				for m, b := range values {
@@ -182,5 +188,10 @@ func newMultiLevelCache(reg prometheus.Registerer, c ...storecache.IndexCache) s
 			Help:    "Histogram to track latency to fetch items from multi level index cache",
 			Buckets: []float64{0.01, 0.1, 0.3, 0.6, 1, 3, 6, 10, 15, 20, 25, 30, 40, 50, 60, 90},
 		}, []string{"item_type"}),
+		backFillLatency: promauto.With(reg).NewHistogramVec(prometheus.HistogramOpts{
+			Name:    "cortex_store_multilevel_index_cache_backfill_duration_seconds",
+			Help:    "Histogram to track latency to backfill items from multi level index cache",
+			Buckets: []float64{0.01, 0.1, 0.3, 0.6, 1, 3, 6, 10, 15, 20, 25, 30, 40, 50, 60, 90},
+		}, []string{"item_type"}),
 	}
 }