Adding a check to make sure UseInstanceMetadata flag is true to get data from metadata.

pkg/cloudprovider/providers/azure/azure_test.go

@@ -1677,6 +1677,7 @@ func TestGetZone(t *testing.T) {
 	cloud := &Cloud{
 		Config: Config{
 			Location:            "eastus",
+			UseInstanceMetadata: true,
 		},
 	}
 	testcases := []struct {

pkg/cloudprovider/providers/azure/azure_zones.go

@@ -19,6 +19,7 @@ package azure
 import (
 	"context"
 	"fmt"
+	"os"
 	"strconv"
 	"strings"
 
@@ -49,6 +50,7 @@ func (az *Cloud) GetZoneID(zoneLabel string) string {
 // GetZone returns the Zone containing the current availability zone and locality region that the program is running in.
 // If the node is not running with availability zones, then it will fall back to fault domain.
 func (az *Cloud) GetZone(ctx context.Context) (cloudprovider.Zone, error) {
+	if az.UseInstanceMetadata {
 		metadata, err := az.metadata.GetMetadata()
 		if err != nil {
 			return cloudprovider.Zone{}, err
@@ -75,6 +77,13 @@ func (az *Cloud) GetZone(ctx context.Context) (cloudprovider.Zone, error) {
 			Region:        az.Location,
 		}, nil
 	}
+	// if UseInstanceMetadata is false, get Zone name by calling ARM
+	hostname, err := os.Hostname()
+	if err != nil {
+		return cloudprovider.Zone{}, fmt.Errorf("failure getting hostname from kernel")
+	}
+	return az.vmSet.GetZoneByNodeName(strings.ToLower(hostname))
+}
 
 // GetZoneByProviderID implements Zones.GetZoneByProviderID
 // This is particularly useful in external cloud providers where the kubelet