Merge pull request #59847 from mtaufen/dkcfg-explicit-keys

Automatic merge from submit-queue (batch tested with PRs 63624, 59847). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

explicit kubelet config key in Node.Spec.ConfigSource.ConfigMap

This makes the Kubelet config key in the ConfigMap an explicit part of
the API, so we can stop using magic key names.
    
As part of this change, we are retiring ConfigMapRef for ConfigMap.


```release-note
You must now specify Node.Spec.ConfigSource.ConfigMap.KubeletConfigKey when using dynamic Kubelet config to tell the Kubelet which key of the ConfigMap identifies its config file.
```

api/openapi-spec/swagger.json

@@ -75671,6 +75671,36 @@
      }
     ]
    },
+   "io.k8s.api.core.v1.ConfigMapNodeConfigSource": {
+    "description": "ConfigMapNodeConfigSource contains the information to reference a ConfigMap as a config source for the Node.",
+    "required": [
+     "namespace",
+     "name",
+     "kubeletConfigKey"
+    ],
+    "properties": {
+     "kubeletConfigKey": {
+      "description": "KubeletConfigKey declares which key of the referenced ConfigMap corresponds to the KubeletConfiguration structure This field is required in all cases.",
+      "type": "string"
+     },
+     "name": {
+      "description": "Name is the metadata.name of the referenced ConfigMap. This field is required in all cases.",
+      "type": "string"
+     },
+     "namespace": {
+      "description": "Namespace is the metadata.namespace of the referenced ConfigMap. This field is required in all cases.",
+      "type": "string"
+     },
+     "resourceVersion": {
+      "description": "ResourceVersion is the metadata.ResourceVersion of the referenced ConfigMap. This field is forbidden in Node.Spec.",
+      "type": "string"
+     },
+     "uid": {
+      "description": "UID is the metadata.UID of the referenced ConfigMap. This field is currently reqired in Node.Spec.",
+      "type": "string"
+     }
+    }
+   },
    "io.k8s.api.core.v1.ConfigMapProjection": {
     "description": "Adapts a ConfigMap into a projected volume.\n\nThe contents of the target ConfigMap's Data field will be presented in a projected volume as files using the keys in the Data field as the file names, unless the items element is populated with specific mappings of keys to paths. Note that this is identical to a configmap volume source without the default mode.",
     "properties": {
@@ -77242,25 +77272,11 @@
    "io.k8s.api.core.v1.NodeConfigSource": {
     "description": "NodeConfigSource specifies a source of node configuration. Exactly one subfield (excluding metadata) must be non-nil.",
     "properties": {
-     "apiVersion": {
-      "description": "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#resources",
-      "type": "string"
-     },
-     "configMapRef": {
-      "$ref": "#/definitions/io.k8s.api.core.v1.ObjectReference"
-     },
-     "kind": {
-      "description": "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds",
-      "type": "string"
+     "configMap": {
+      "description": "ConfigMap is a reference to a Node's ConfigMap",
+      "$ref": "#/definitions/io.k8s.api.core.v1.ConfigMapNodeConfigSource"
      }
-    },
-    "x-kubernetes-group-version-kind": [
-     {
-      "group": "",
-      "kind": "NodeConfigSource",
-      "version": "v1"
-     }
-    ]
+    }
    },
    "io.k8s.api.core.v1.NodeDaemonEndpoints": {
     "description": "NodeDaemonEndpoints lists ports opened by daemons running on the Node.",