diff --git a/core/base/metric_item.go b/core/base/metric_item.go
index a2ac248b9..1915d930e 100644
--- a/core/base/metric_item.go
+++ b/core/base/metric_item.go
@@ -13,12 +13,12 @@ const metricPartSeparator = "|"
 
 // MetricItem represents the data of metric log per line.
 type MetricItem struct {
-	Resource       string
-	Classification int32
-	Timestamp      uint64
-
+	Resource        string
+	Classification  int32
+	Timestamp       uint64
 	PassQps         uint64
 	BlockQps        uint64
+	MonitorBlockQps uint64
 	CompleteQps     uint64
 	ErrorQps        uint64
 	AvgRt           uint64
@@ -35,10 +35,10 @@ func (m *MetricItem) ToFatString() (string, error) {
 	timeStr := util.FormatTimeMillis(m.Timestamp)
 	// All "|" in the resource name will be replaced with "_"
 	finalName := strings.ReplaceAll(m.Resource, "|", "_")
-	_, err := fmt.Fprintf(&b, "%d|%s|%s|%d|%d|%d|%d|%d|%d|%d|%d",
+	_, err := fmt.Fprintf(&b, "%d|%s|%s|%d|%d|%d|%d|%d|%d|%d|%d|%d",
 		m.Timestamp, timeStr, finalName, m.PassQps,
 		m.BlockQps, m.CompleteQps, m.ErrorQps, m.AvgRt,
-		m.OccupiedPassQps, m.Concurrency, m.Classification)
+		m.OccupiedPassQps, m.Concurrency, m.Classification, m.MonitorBlockQps)
 	if err != nil {
 		return "", err
 	}
@@ -48,10 +48,10 @@ func (m *MetricItem) ToFatString() (string, error) {
 func (m *MetricItem) ToThinString() (string, error) {
 	b := strings.Builder{}
 	finalName := strings.ReplaceAll(m.Resource, "|", "_")
-	_, err := fmt.Fprintf(&b, "%d|%s|%d|%d|%d|%d|%d|%d|%d|%d",
+	_, err := fmt.Fprintf(&b, "%d|%s|%d|%d|%d|%d|%d|%d|%d|%d|%d",
 		m.Timestamp, finalName, m.PassQps,
 		m.BlockQps, m.CompleteQps, m.ErrorQps, m.AvgRt,
-		m.OccupiedPassQps, m.Concurrency, m.Classification)
+		m.OccupiedPassQps, m.Concurrency, m.Classification, m.MonitorBlockQps)
 	if err != nil {
 		return "", err
 	}
@@ -120,5 +120,12 @@ func MetricItemFromFatString(line string) (*MetricItem, error) {
 		}
 		item.Classification = int32(cl)
 	}
+	if len(arr) >= 12 {
+		mb, err := strconv.ParseUint(arr[11], 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		item.MonitorBlockQps = mb
+	}
 	return item, nil
 }
diff --git a/core/base/metric_item_test.go b/core/base/metric_item_test.go
index 2b34c6028..7ec69ca9b 100644
--- a/core/base/metric_item_test.go
+++ b/core/base/metric_item_test.go
@@ -1,12 +1,13 @@
 package base
 
 import (
-	"github.com/stretchr/testify/assert"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestMetricItemFromFatStringLegal(t *testing.T) {
-	line1 := "1564382218000|2019-07-29 14:36:58|/foo/*|4|9|3|0|25|0|2|1"
+	line1 := "1564382218000|2019-07-29 14:36:58|/foo/*|4|9|3|0|25|0|2|1|10"
 	item1, err := MetricItemFromFatString(line1)
 	assert.NoError(t, err)
 	assert.Equal(t, uint64(1564382218000), item1.Timestamp)
@@ -17,6 +18,7 @@ func TestMetricItemFromFatStringLegal(t *testing.T) {
 	assert.Equal(t, uint64(25), item1.AvgRt)
 	assert.Equal(t, "/foo/*", item1.Resource)
 	assert.Equal(t, int32(1), item1.Classification)
+	assert.Equal(t, uint64(10), item1.MonitorBlockQps)
 }
 
 func TestMetricItemFromFatStringIllegal(t *testing.T) {
diff --git a/core/stat/base/metric_bucket_test.go b/core/stat/base/metric_bucket_test.go
index 3a60d50ab..c4ae1c027 100644
--- a/core/stat/base/metric_bucket_test.go
+++ b/core/stat/base/metric_bucket_test.go
@@ -1,17 +1,19 @@
 package base
 
 import (
-	"github.com/alibaba/sentinel-golang/core/base"
+	"fmt"
 	"sync"
 	"testing"
 	"unsafe"
+
+	"github.com/alibaba/sentinel-golang/core/base"
 )
 
 func Test_metricBucket_MemSize(t *testing.T) {
 	mb := NewMetricBucket()
 	size := unsafe.Sizeof(*mb)
-	if size != 48 {
-		t.Error("unexpect memory size of MetricBucket")
+	if size != 56 {
+		t.Error(fmt.Sprintf("unexpect memory size of MetricBucket: %d", size))
 	}
 }
 
diff --git a/core/stat/base/sliding_window_metric.go b/core/stat/base/sliding_window_metric.go
index 0b2ddc958..997d002b7 100644
--- a/core/stat/base/sliding_window_metric.go
+++ b/core/stat/base/sliding_window_metric.go
@@ -2,9 +2,10 @@ package base
 
 import (
 	"fmt"
+	"sync/atomic"
+
 	"github.com/alibaba/sentinel-golang/core/base"
 	"github.com/alibaba/sentinel-golang/util"
-	"sync/atomic"
 )
 
 // SlidingWindowMetric represents the sliding window metric wrapper.
@@ -215,6 +216,7 @@ func (m *SlidingWindowMetric) metricItemFromBuckets(ts uint64, ws []*bucketWrap)
 		item.BlockQps += uint64(mb.Get(base.MetricEventBlock))
 		item.ErrorQps += uint64(mb.Get(base.MetricEventError))
 		item.CompleteQps += uint64(mb.Get(base.MetricEventComplete))
+		item.MonitorBlockQps += uint64(mb.Get(base.MetricEventMonitorBlock))
 		allRt += mb.Get(base.MetricEventRt)
 	}
 	if item.CompleteQps > 0 {
@@ -238,11 +240,12 @@ func (m *SlidingWindowMetric) metricItemFromBucket(w *bucketWrap) *base.MetricIt
 	}
 	completeQps := mb.Get(base.MetricEventComplete)
 	item := &base.MetricItem{
-		PassQps:     uint64(mb.Get(base.MetricEventPass)),
-		BlockQps:    uint64(mb.Get(base.MetricEventBlock)),
-		ErrorQps:    uint64(mb.Get(base.MetricEventError)),
-		CompleteQps: uint64(completeQps),
-		Timestamp:   w.bucketStart,
+		PassQps:         uint64(mb.Get(base.MetricEventPass)),
+		BlockQps:        uint64(mb.Get(base.MetricEventBlock)),
+		MonitorBlockQps: uint64(mb.Get(base.MetricEventMonitorBlock)),
+		ErrorQps:        uint64(mb.Get(base.MetricEventError)),
+		CompleteQps:     uint64(completeQps),
+		Timestamp:       w.bucketStart,
 	}
 	if completeQps > 0 {
 		item.AvgRt = uint64(mb.Get(base.MetricEventRt) / completeQps)