metadata: clarify networking variables

bootstrapper/internal/kubernetes/kubernetes.go

@@ -120,7 +120,7 @@ func (k *KubeWrapper) InitCluster(
 		nodeName = k8sCompliantHostname(instance.Name)
 		providerID = instance.ProviderID
 		nodeIP = instance.VPCIP
-		subnetworkPodCIDR = instance.SubnetworkCIDR
+		subnetworkPodCIDR = instance.SecondaryIPRange
 
 		if len(instance.AliasIPRanges) > 0 {
 			nodePodCIDR = instance.AliasIPRanges[0]

internal/cloud/gcp/metadata.go

@@ -92,7 +92,7 @@ func (m *Metadata) Self(ctx context.Context) (metadata.InstanceMetadata, error)
 	if err != nil {
 		return metadata.InstanceMetadata{}, err
 	}
-	instance.SubnetworkCIDR = subnetCIDR
+	instance.SecondaryIPRange = subnetCIDR
 
 	return instance, nil
 }

internal/cloud/metadata/metadata.go

@@ -25,13 +25,16 @@ type InstanceMetadata struct {
 	VPCIP string
 	// PublicIP is the primary public IP of the instance, if available, empty string otherwise.
 	PublicIP string
-	AliasIPRanges []string
 	// SSHKeys maps usernames to ssh public keys.
 	SSHKeys map[string][]string
 
-	// SubnetworkCIDR is the CIDR of the subnetwork the instance is in.
+	// SecondaryIPRange is the VPC wide CIDR from which subnets are attached to VMs as AliasIPRanges.
 	// May be empty on certain CSPs.
-	SubnetworkCIDR string
+	SecondaryIPRange string
+
+	// AliasIPRanges is a list of IP ranges that are attached.
+	// May be empty on certain CSPs.
+	AliasIPRanges []string
 }
 
 type InstanceSelfer interface {