define endpointslice.endpoints as optional

The field is actually optional but defined as required in OpenAPI, causing issues
with clients that expected the field to be required when it was not.

api/openapi-spec/swagger.json

@@ -12804,8 +12804,7 @@
         }
       },
       "required": [
-        "addressType",
-        "endpoints"
+        "addressType"
       ],
       "type": "object",
       "x-kubernetes-group-version-kind": [

api/openapi-spec/v3/apis__discovery.k8s.io__v1_openapi.json

@@ -226,8 +226,7 @@
           }
         },
         "required": [
-          "addressType",
-          "endpoints"
+          "addressType"
         ],
         "type": "object",
         "x-kubernetes-group-version-kind": [

pkg/generated/openapi/zz_generated.openapi.go

@@ -33256,7 +33256,7 @@ func schema_k8sio_api_discovery_v1_EndpointSlice(ref common.ReferenceCallback) c
 						},
 					},
 				},
-				Required: []string{"addressType", "endpoints"},
+				Required: []string{"addressType"},
 			},
 		},
 		Dependencies: []string{

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

@@ -185,6 +185,7 @@ message EndpointSlice {
 
   // endpoints is a list of unique endpoints in this slice. Each slice may
   // include a maximum of 1000 endpoints.
+  // +optional
   // +listType=atomic
   repeated Endpoint endpoints = 2;
 

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

@@ -52,6 +52,7 @@ type EndpointSlice struct {
 
 	// endpoints is a list of unique endpoints in this slice. Each slice may
 	// include a maximum of 1000 endpoints.
+	// +optional
 	// +listType=atomic
 	Endpoints []Endpoint `json:"endpoints" protobuf:"bytes,2,rep,name=endpoints"`