Fix missing public IP addresses in Azure service discovery (#13241)

Fixes #5588, #9293

Signed-off-by: Gavin Lam <gavin.oss@tutamail.com>

discovery/azure/azure.go

@@ -28,6 +28,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/cloud"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/to"
 	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
 	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v4"
 	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork/v2"
@@ -638,7 +639,7 @@ func (client *azureClient) getNetworkInterfaceByID(ctx context.Context, networkI
 		return nil, fmt.Errorf("could not parse network interface ID: %w", err)
 	}
 
-	resp, err := client.nic.Get(ctx, r.ResourceGroupName, r.Name, nil)
+	resp, err := client.nic.Get(ctx, r.ResourceGroupName, r.Name, &armnetwork.InterfacesClientGetOptions{Expand: to.Ptr("IPConfigurations/PublicIPAddress")})
 	if err != nil {
 		var responseError *azcore.ResponseError
 		if errors.As(err, &responseError) && responseError.StatusCode == http.StatusNotFound {