make PodIP.IP and HostIP.IP required.

Fields used as map keys must be required or defaulted when used in a CRD schema.

see https://github.com/kubernetes/kubernetes/issues/124540

Signed-off-by: Lan Liang <gcslyp@gmail.com>

api/openapi-spec/swagger.json

@@ -7482,6 +7482,9 @@
           "type": "string"
         }
       },
+      "required": [
+        "ip"
+      ],
       "type": "object"
     },
     "io.k8s.api.core.v1.HostPathVolumeSource": {
@@ -9293,6 +9296,9 @@
           "type": "string"
         }
       },
+      "required": [
+        "ip"
+      ],
       "type": "object"
     },
     "io.k8s.api.core.v1.PodList": {

api/openapi-spec/v3/api__v1_openapi.json

@@ -2814,10 +2814,14 @@
         "description": "HostIP represents a single IP address allocated to the host.",
         "properties": {
           "ip": {
+            "default": "",
             "description": "IP is the IP address assigned to the host",
             "type": "string"
           }
         },
+        "required": [
+          "ip"
+        ],
         "type": "object"
       },
       "io.k8s.api.core.v1.HostPathVolumeSource": {
@@ -5165,10 +5169,14 @@
         "description": "PodIP represents a single IP address allocated to the pod.",
         "properties": {
           "ip": {
+            "default": "",
             "description": "IP is the IP address assigned to the pod",
             "type": "string"
           }
         },
+        "required": [
+          "ip"
+        ],
         "type": "object"
       },
       "io.k8s.api.core.v1.PodList": {

pkg/generated/openapi/zz_generated.openapi.go

@@ -23024,11 +23024,13 @@ func schema_k8sio_api_core_v1_HostIP(ref common.ReferenceCallback) common.OpenAP
 					"ip": {
 						SchemaProps: spec.SchemaProps{
 							Description: "IP is the IP address assigned to the host",
+							Default:     "",
 							Type:        []string{"string"},
 							Format:      "",
 						},
 					},
 				},
+				Required: []string{"ip"},
 			},
 		},
 	}
@@ -26744,11 +26746,13 @@ func schema_k8sio_api_core_v1_PodIP(ref common.ReferenceCallback) common.OpenAPI
 					"ip": {
 						SchemaProps: spec.SchemaProps{
 							Description: "IP is the IP address assigned to the pod",
+							Default:     "",
 							Type:        []string{"string"},
 							Format:      "",
 						},
 					},
 				},
+				Required: []string{"ip"},
 			},
 		},
 	}

staging/src/k8s.io/api/core/v1/generated.proto

@@ -1990,6 +1990,7 @@ message HostAlias {
 // HostIP represents a single IP address allocated to the host.
 message HostIP {
   // IP is the IP address assigned to the host
+  // +required
   optional string ip = 1;
 }
 
@@ -3702,6 +3703,7 @@ message PodExecOptions {
 // PodIP represents a single IP address allocated to the pod.
 message PodIP {
   // IP is the IP address assigned to the pod
+  // +required
   optional string ip = 1;
 }
 

staging/src/k8s.io/api/core/v1/types.go

@@ -4424,13 +4424,15 @@ type PodDNSConfigOption struct {
 // PodIP represents a single IP address allocated to the pod.
 type PodIP struct {
 	// IP is the IP address assigned to the pod
-	IP string `json:"ip,omitempty" protobuf:"bytes,1,opt,name=ip"`
+	// +required
+	IP string `json:"ip" protobuf:"bytes,1,opt,name=ip"`
 }
 
 // HostIP represents a single IP address allocated to the host.
 type HostIP struct {
 	// IP is the IP address assigned to the host
-	IP string `json:"ip,omitempty" protobuf:"bytes,1,opt,name=ip"`
+	// +required
+	IP string `json:"ip" protobuf:"bytes,1,opt,name=ip"`
 }
 
 // EphemeralContainerCommon is a copy of all fields in Container to be inlined in

staging/src/k8s.io/client-go/applyconfigurations/internal/internal.go

@@ -5665,6 +5665,7 @@ var schemaYAML = typed.YAMLObject(`types:
     - name: ip
       type:
         scalar: string
+      default: ""
 - name: io.k8s.api.core.v1.HostPathVolumeSource
   map:
     fields:
@@ -6770,6 +6771,7 @@ var schemaYAML = typed.YAMLObject(`types:
     - name: ip
       type:
         scalar: string
+      default: ""
 - name: io.k8s.api.core.v1.PodOS
   map:
     fields: