Fix typos and imports. (#1139)

* Fix a typo: Lable -> Label.

* Fix import order.

Author: songy23

metric/metricexport/reader.go

@@ -16,14 +16,14 @@
 package metricexport
 
 import (
+	"context"
 	"fmt"
+	"sync"
 	"time"
 
-	"context"
 	"go.opencensus.io/metric/metricdata"
 	"go.opencensus.io/metric/metricproducer"
 	"go.opencensus.io/trace"
-	"sync"
 )
 
 var (

stats/view/view_to_metric.go

@@ -73,7 +73,7 @@ func getType(v *View) metricdata.Type {
 	}
 }
 
-func getLableKeys(v *View) []metricdata.LabelKey {
+func getLabelKeys(v *View) []metricdata.LabelKey {
 	labelKeys := []metricdata.LabelKey{}
 	for _, k := range v.TagKeys {
 		labelKeys = append(labelKeys, metricdata.LabelKey{Key: k.Name()})
@@ -87,7 +87,7 @@ func viewToMetricDescriptor(v *View) *metricdata.Descriptor {
 		Description: v.Description,
 		Unit:        getUnit(v.Measure.Unit()),
 		Type:        getType(v),
-		LabelKeys:   getLableKeys(v),
+		LabelKeys:   getLabelKeys(v),
 	}
 }
 

stats/view/view_to_metric_test.go

@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"encoding/json"
+
 	"github.com/google/go-cmp/cmp"
 	"go.opencensus.io/metric/metricdata"
 	"go.opencensus.io/stats"