refactor: use omitzero instead of omitempty for struct fields

Go 1.24 introduced the omitzero JSON tag option which properly handles
struct fields.

Signed-off-by: kahirokunn <okinakahiro@gmail.com>

Author: kahirokunn

pkg/apis/networking/v1alpha1/certificate_types.go

@@ -36,17 +36,17 @@ type Certificate struct {
 	// Standard object's metadata.
 	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ObjectMeta `json:"metadata,omitempty"`
+	metav1.ObjectMeta `json:"metadata,omitzero"`
 
 	// Spec is the desired state of the Certificate.
 	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Spec CertificateSpec `json:"spec,omitempty"`
+	Spec CertificateSpec `json:"spec,omitzero"`
 
 	// Status is the current state of the Certificate.
 	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Status CertificateStatus `json:"status,omitempty"`
+	Status CertificateStatus `json:"status,omitzero"`
 }
 
 // Verify that Certificate adheres to the appropriate interfaces.
@@ -70,7 +70,7 @@ type CertificateList struct {
 	// Standard object's metadata.
 	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ListMeta `json:"metadata,omitempty"`
+	metav1.ListMeta `json:"metadata,omitzero"`
 
 	// Items is the list of `Certificate`.
 	Items []Certificate `json:"items"`
@@ -121,7 +121,7 @@ type HTTP01Challenge struct {
 	ServiceNamespace string `json:"serviceNamespace,omitempty"`
 
 	// ServicePort is the port of the service to serve HTTP01 challenge requests.
-	ServicePort intstr.IntOrString `json:"servicePort,omitempty"`
+	ServicePort intstr.IntOrString `json:"servicePort,omitzero"`
 }
 
 // GetStatus retrieves the status of the Certificate. Implements the KRShaped interface.

pkg/apis/networking/v1alpha1/domainclaim_types.go

@@ -31,12 +31,12 @@ type ClusterDomainClaim struct {
 	// Standard object's metadata.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ObjectMeta `json:"metadata,omitempty"`
+	metav1.ObjectMeta `json:"metadata,omitzero"`
 
 	// Spec is the desired state of the ClusterDomainClaim.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Spec ClusterDomainClaimSpec `json:"spec,omitempty"`
+	Spec ClusterDomainClaimSpec `json:"spec,omitzero"`
 }
 
 // Check that we can create OwnerReferences to a ClusterDomainClaim.
@@ -50,7 +50,7 @@ type ClusterDomainClaimList struct {
 	// Standard object metadata.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ListMeta `json:"metadata,omitempty"`
+	metav1.ListMeta `json:"metadata,omitzero"`
 
 	// Items is the list of ClusterDomainClaim objects.
 	Items []ClusterDomainClaim `json:"items"`

pkg/apis/networking/v1alpha1/ingress_types.go

@@ -39,17 +39,17 @@ type Ingress struct {
 	// Standard object's metadata.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ObjectMeta `json:"metadata,omitempty"`
+	metav1.ObjectMeta `json:"metadata,omitzero"`
 
 	// Spec is the desired state of the Ingress.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Spec IngressSpec `json:"spec,omitempty"`
+	Spec IngressSpec `json:"spec,omitzero"`
 
 	// Status is the current state of the Ingress.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Status IngressStatus `json:"status,omitempty"`
+	Status IngressStatus `json:"status,omitzero"`
 }
 
 // Verify that Ingress adheres to the appropriate interfaces.
@@ -73,7 +73,7 @@ type IngressList struct {
 	// Standard object metadata.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ListMeta `json:"metadata,omitempty"`
+	metav1.ListMeta `json:"metadata,omitzero"`
 
 	// Items is the list of Ingress objects.
 	Items []Ingress `json:"items"`

pkg/apis/networking/v1alpha1/serverlessservice_types.go

@@ -38,17 +38,17 @@ type ServerlessService struct {
 	// Standard object's metadata.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ObjectMeta `json:"metadata,omitempty"`
+	metav1.ObjectMeta `json:"metadata,omitzero"`
 
 	// Spec is the desired state of the ServerlessService.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Spec ServerlessServiceSpec `json:"spec,omitempty"`
+	Spec ServerlessServiceSpec `json:"spec,omitzero"`
 
 	// Status is the current state of the ServerlessService.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
 	// +optional
-	Status ServerlessServiceStatus `json:"status,omitempty"`
+	Status ServerlessServiceStatus `json:"status,omitzero"`
 }
 
 // Verify that ServerlessService adheres to the appropriate interfaces.
@@ -72,7 +72,7 @@ type ServerlessServiceList struct {
 	// Standard object's metadata.
 	// More info: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#metadata
 	// +optional
-	metav1.ListMeta `json:"metadata,omitempty"`
+	metav1.ListMeta `json:"metadata,omitzero"`
 
 	// Items is the list of ServerlessService.
 	Items []ServerlessService `json:"items"`