feat: Add App Gateway Subnet ID as a field to the Overlay Extension Config CRD (#3925)

* feat: Add App Gateway Subnet ID as a field to the Overlay Extension Config CRD

* fix: Fixed the lint error from the pipeline

* fix: Fixed the CRD Generation error from the pipelines

* fix: Updated the name to be specific that we require the subnet Guid and not ARM ID

* fix: Keeping the IP Range field as optional

* fix: Making the App Gateway Subnet ID  field as optional to avoid breaking existing clusters where this field is not populated

* fix: Updated CRD to fix CRDGen Error

Author: nairashu

crd/overlayextensionconfig/api/v1alpha1/overlayextensionconfig_types.go

@@ -34,11 +34,15 @@ type OverlayExtensionConfigList struct {
 // +kubebuilder:validation:XValidation:rule="!has(oldSelf.extensionIPRange) || has(self.extensionIPRange)", message="ExtensionIPRange is required once set"
 type OverlayExtensionConfigSpec struct {
 	// ExtensionIPRange field defines a CIDR that should be able to reach routing domain ip addresses.
-	// +kubebuilder:validation:Optional
 	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="Value is immutable"
 	// +kubebuilder:validation:MaxLength=43
 	// 43 is max length of IPv6 CIDR string
 	ExtensionIPRange string `json:"extensionIPRange,omitempty"`
+
+	// AppGatewaySubnetGUID field defines a subnet delegated to Application Gateway that should be able to reach routing domain ip addresses. This needs to be a valid GUID.
+	// +kubebuilder:validation:Optional
+	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="Value is immutable"
+	AppGatewaySubnetGUID string `json:"appGatewaySubnetGUID,omitempty"`
 }
 
 type OECState string

crd/overlayextensionconfig/manifests/acn.azure.com_overlayextensionconfigs.yaml

@@ -47,6 +47,14 @@ spec:
           spec:
             description: OverlayExtensionConfigSpec defines the desired state of OverlayExtensionConfig.
             properties:
+              appGatewaySubnetGUID:
+                description: AppGatewaySubnetGUID field defines a subnet delegated
+                  to Application Gateway that should be able to reach routing domain
+                  ip addresses. This needs to be a valid GUID.
+                type: string
+                x-kubernetes-validations:
+                - message: Value is immutable
+                  rule: self == oldSelf
               extensionIPRange:
                 description: |-
                   ExtensionIPRange field defines a CIDR that should be able to reach routing domain ip addresses.