diff --git a/core/mathx/unstable.go b/core/mathx/unstable.go
index 23eccc39..33dfda5a 100644
--- a/core/mathx/unstable.go
+++ b/core/mathx/unstable.go
@@ -36,7 +36,7 @@ func (u Unstable) AroundDuration(base time.Duration) time.Duration {
 	return val
 }
 
-// AroundInt returns a randome int64 with given base and deviation.
+// AroundInt returns a random int64 with given base and deviation.
 func (u Unstable) AroundInt(base int64) int64 {
 	u.lock.Lock()
 	val := int64((1 + u.deviation - 2*u.deviation*u.r.Float64()) * float64(base))
diff --git a/core/metric/counter.go b/core/metric/counter.go
index f34700cf..aecbe373 100644
--- a/core/metric/counter.go
+++ b/core/metric/counter.go
@@ -12,7 +12,7 @@ type (
 	// CounterVec interface represents a counter vector.
 	CounterVec interface {
 		// Inc increments labels.
-		Inc(lables ...string)
+		Inc(labels ...string)
 		// Add adds labels with v.
 		Add(v float64, labels ...string)
 		close() bool
@@ -50,8 +50,8 @@ func (cv *promCounterVec) Inc(labels ...string) {
 	cv.counter.WithLabelValues(labels...).Inc()
 }
 
-func (cv *promCounterVec) Add(v float64, lables ...string) {
-	cv.counter.WithLabelValues(lables...).Add(v)
+func (cv *promCounterVec) Add(v float64, labels ...string) {
+	cv.counter.WithLabelValues(labels...).Add(v)
 }
 
 func (cv *promCounterVec) close() bool {
diff --git a/core/metric/gauge.go b/core/metric/gauge.go
index ae08bb8f..01fbfe80 100644
--- a/core/metric/gauge.go
+++ b/core/metric/gauge.go
@@ -20,7 +20,7 @@ type (
 		close() bool
 	}
 
-	promGuageVec struct {
+	promGaugeVec struct {
 		gauge *prom.GaugeVec
 	}
 )
@@ -39,7 +39,7 @@ func NewGaugeVec(cfg *GaugeVecOpts) GaugeVec {
 			Help:      cfg.Help,
 		}, cfg.Labels)
 	prom.MustRegister(vec)
-	gv := &promGuageVec{
+	gv := &promGaugeVec{
 		gauge: vec,
 	}
 	proc.AddShutdownListener(func() {
@@ -49,18 +49,18 @@ func NewGaugeVec(cfg *GaugeVecOpts) GaugeVec {
 	return gv
 }
 
-func (gv *promGuageVec) Inc(labels ...string) {
+func (gv *promGaugeVec) Inc(labels ...string) {
 	gv.gauge.WithLabelValues(labels...).Inc()
 }
 
-func (gv *promGuageVec) Add(v float64, lables ...string) {
-	gv.gauge.WithLabelValues(lables...).Add(v)
+func (gv *promGaugeVec) Add(v float64, labels ...string) {
+	gv.gauge.WithLabelValues(labels...).Add(v)
 }
 
-func (gv *promGuageVec) Set(v float64, lables ...string) {
-	gv.gauge.WithLabelValues(lables...).Set(v)
+func (gv *promGaugeVec) Set(v float64, labels ...string) {
+	gv.gauge.WithLabelValues(labels...).Set(v)
 }
 
-func (gv *promGuageVec) close() bool {
+func (gv *promGaugeVec) close() bool {
 	return prom.Unregister(gv.gauge)
 }
diff --git a/core/metric/gauge_test.go b/core/metric/gauge_test.go
index 3a504c15..534889fb 100644
--- a/core/metric/gauge_test.go
+++ b/core/metric/gauge_test.go
@@ -29,7 +29,7 @@ func TestGaugeInc(t *testing.T) {
 		Labels:    []string{"path"},
 	})
 	defer gaugeVec.close()
-	gv, _ := gaugeVec.(*promGuageVec)
+	gv, _ := gaugeVec.(*promGaugeVec)
 	gv.Inc("/users")
 	gv.Inc("/users")
 	r := testutil.ToFloat64(gv.gauge)
@@ -45,7 +45,7 @@ func TestGaugeAdd(t *testing.T) {
 		Labels:    []string{"path"},
 	})
 	defer gaugeVec.close()
-	gv, _ := gaugeVec.(*promGuageVec)
+	gv, _ := gaugeVec.(*promGaugeVec)
 	gv.Add(-10, "/classroom")
 	gv.Add(30, "/classroom")
 	r := testutil.ToFloat64(gv.gauge)
@@ -61,7 +61,7 @@ func TestGaugeSet(t *testing.T) {
 		Labels:    []string{"path"},
 	})
 	gaugeVec.close()
-	gv, _ := gaugeVec.(*promGuageVec)
+	gv, _ := gaugeVec.(*promGaugeVec)
 	gv.Set(666, "/users")
 	r := testutil.ToFloat64(gv.gauge)
 	assert.Equal(t, float64(666), r)
diff --git a/core/metric/histogram.go b/core/metric/histogram.go
index 0f759e91..59513db8 100644
--- a/core/metric/histogram.go
+++ b/core/metric/histogram.go
@@ -19,7 +19,7 @@ type (
 	// A HistogramVec interface represents a histogram vector.
 	HistogramVec interface {
 		// Observe adds observation v to labels.
-		Observe(v int64, lables ...string)
+		Observe(v int64, labels ...string)
 		close() bool
 	}