Field status.hostIPs added for Pod (#101566)

* Add FeatureGate PodHostIPs

* Add HostIPs field and update PodIPs field

* Types conversion

* Add dropDisabledStatusFields

* Add HostIPs for kubelet

* Add fuzzer for PodStatus

* Add status.hostIPs in ConvertDownwardAPIFieldLabel

* Add status.hostIPs in validEnvDownwardAPIFieldPathExpressions

* Downward API support for status.hostIPs

* Add DownwardAPI validation for status.hostIPs

* Add e2e to check that hostIPs works

* Add e2e to check that Downward API works

* Regenerate

api/openapi-spec/v3/api__v1_openapi.json

@@ -2221,6 +2221,16 @@
         },
         "type": "object"
       },
+      "io.k8s.api.core.v1.HostIP": {
+        "description": "HostIP address information for entries in the (plural) HostIPs field.",
+        "properties": {
+          "ip": {
+            "description": "IP is the IP address assigned to the host",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
       "io.k8s.api.core.v1.HostPathVolumeSource": {
         "description": "Represents a host path mapped into a pod. Host path volumes do not support ownership management or SELinux relabeling.",
         "properties": {
@@ -4008,10 +4018,10 @@
         "type": "object"
       },
       "io.k8s.api.core.v1.PodIP": {
-        "description": "IP address information for entries in the (plural) PodIPs field. Each entry includes:\n   IP: An IP address allocated to the pod. Routable at least within the cluster.",
+        "description": "PodIP address information for entries in the (plural) PodIPs field.",
         "properties": {
           "ip": {
-            "description": "ip is an IP address (IPv4 or IPv6) assigned to the pod",
+            "description": "IP is the IP address assigned to the pod",
             "type": "string"
           }
         },
@@ -4401,9 +4411,20 @@
             "type": "array"
           },
           "hostIP": {
-            "description": "IP address of the host to which the pod is assigned. Empty if not yet scheduled.",
+            "description": "hostIP holds the IP address of the host to which the pod is assigned. Empty if the pod has not started yet. A pod can be assigned to a node that has a problem in kubelet which in turns mean that HostIP will not be updated even if there is node is assigned to pod",
             "type": "string"
           },
+          "hostIPs": {
+            "description": "hostIPs holds the IP addresses allocated to the host. If this field is specified, the first entry must match the hostIP field. This list is empty if the pod has not started yet. A pod can be assigned to a node that has a problem in kubelet which in turns means that HostIPs will not be updated even if there is a node is assigned to this pod.",
+            "items": {
+              "$ref": "#/components/schemas/io.k8s.api.core.v1.HostIP",
+              "default": {}
+            },
+            "type": "array",
+            "x-kubernetes-list-type": "set",
+            "x-kubernetes-patch-merge-key": "ip",
+            "x-kubernetes-patch-strategy": "merge"
+          },
           "initContainerStatuses": {
             "description": "The list has one entry per init container in the manifest. The most recent successful init container will have ready = true, the most recently started container will have startTime set. More info: https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#pod-and-container-status",
             "items": {
@@ -4432,7 +4453,7 @@
             "type": "string"
           },
           "podIP": {
-            "description": "IP address allocated to the pod. Routable at least within the cluster. Empty if not yet allocated.",
+            "description": "podIP address allocated to the pod. Routable at least within the cluster. Empty if not yet allocated.",
             "type": "string"
           },
           "podIPs": {