diff --git a/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.json b/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.json
index 06616c570d7..6d9e8b963b7 100644
--- a/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.json
+++ b/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.json
@@ -69,7 +69,7 @@
     "kind": "31",
     "namespace": "32",
     "name": "33",
-    "uid": "ʤ脽ěĂ凗蓏Ŋ蛊ĉy緅縕\u003eŽ",
+    "uid": "5ƗǸƢ6/ʕVŚ(ĿȊ甞",
     "apiVersion": "34",
     "resourceVersion": "35",
     "fieldPath": "36"
diff --git a/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.pb b/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.pb
index f059eb7195e..a05a6b8a8b5 100644
Binary files a/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.pb and b/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.pb differ
diff --git a/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.yaml b/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.yaml
index e3f26f31b6e..f61366f9a2d 100644
--- a/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.yaml
+++ b/staging/src/k8s.io/api/testdata/HEAD/core.v1.Event.yaml
@@ -51,7 +51,7 @@ related:
   name: "33"
   namespace: "32"
   resourceVersion: "35"
-  uid: ʤ脽ěĂ凗蓏Ŋ蛊ĉy緅縕>Ž
+  uid: 5ƗǸƢ6/ʕVŚ(ĿȊ甞
 reportingComponent: "37"
 reportingInstance: "38"
 series:
diff --git a/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.json b/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.json
index e12af7ef75f..443f7f23c68 100644
--- a/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.json
+++ b/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.json
@@ -43,8 +43,7 @@
   "eventTime": "2482-03-20T23:11:25.602224Z",
   "series": {
     "count": -1971381490,
-    "lastObservedTime": "2429-02-18T17:57:56.343118Z",
-    "state": "鯹)晿\u003c"
+    "lastObservedTime": "2429-02-18T17:57:56.343118Z"
   },
   "reportingController": "19",
   "reportingInstance": "20",
@@ -54,7 +53,7 @@
     "kind": "23",
     "namespace": "24",
     "name": "25",
-    "uid": "Ĩɘ.蘯6ċV夸eɑeʤ脽ěĂ",
+    "uid": "鯹)晿\u003c",
     "apiVersion": "26",
     "resourceVersion": "27",
     "fieldPath": "28"
@@ -63,7 +62,7 @@
     "kind": "29",
     "namespace": "30",
     "name": "31",
-    "uid": "蓏Ŋ",
+    "uid": ",c鮽ort昍řČ扷5ƗǸƢ6/ʕ",
     "apiVersion": "32",
     "resourceVersion": "33",
     "fieldPath": "34"
@@ -74,7 +73,7 @@
     "component": "37",
     "host": "38"
   },
-  "deprecatedFirstTimestamp": "2964-12-12T12:04:40Z",
-  "deprecatedLastTimestamp": "2452-08-27T22:01:15Z",
-  "deprecatedCount": 1804227960
+  "deprecatedFirstTimestamp": "2235-03-09T09:44:15Z",
+  "deprecatedLastTimestamp": "2964-12-12T12:04:40Z",
+  "deprecatedCount": -180456314
 }
\ No newline at end of file
diff --git a/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.pb b/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.pb
index dd6fa6cd910..20d3c67a190 100644
Binary files a/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.pb and b/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.pb differ
diff --git a/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.yaml b/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.yaml
index 62bba948a5e..813e47ff9ca 100644
--- a/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.yaml
+++ b/staging/src/k8s.io/api/testdata/HEAD/events.k8s.io.v1beta1.Event.yaml
@@ -1,8 +1,8 @@
 action: "21"
 apiVersion: events.k8s.io/v1beta1
-deprecatedCount: 1804227960
-deprecatedFirstTimestamp: "2964-12-12T12:04:40Z"
-deprecatedLastTimestamp: "2452-08-27T22:01:15Z"
+deprecatedCount: -180456314
+deprecatedFirstTimestamp: "2235-03-09T09:44:15Z"
+deprecatedLastTimestamp: "2964-12-12T12:04:40Z"
 deprecatedSource:
   component: "37"
   host: "38"
@@ -46,7 +46,7 @@ regarding:
   name: "25"
   namespace: "24"
   resourceVersion: "27"
-  uid: Ĩɘ.蘯6ċV夸eɑeʤ脽ěĂ
+  uid: 鯹)晿<
 related:
   apiVersion: "32"
   fieldPath: "34"
@@ -54,11 +54,10 @@ related:
   name: "31"
   namespace: "30"
   resourceVersion: "33"
-  uid: 蓏Ŋ
+  uid: ',c鮽ort昍řČ扷5ƗǸƢ6/ʕ'
 reportingController: "19"
 reportingInstance: "20"
 series:
   count: -1971381490
   lastObservedTime: "2429-02-18T17:57:56.343118Z"
-  state: 鯹)晿<
 type: "36"
diff --git a/staging/src/k8s.io/api/testdata/v1.17.0/core.v1.Event.after_roundtrip.pb b/staging/src/k8s.io/api/testdata/v1.17.0/core.v1.Event.after_roundtrip.pb
new file mode 100644
index 00000000000..1f7bd435715
Binary files /dev/null and b/staging/src/k8s.io/api/testdata/v1.17.0/core.v1.Event.after_roundtrip.pb differ
diff --git a/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.json b/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.json
new file mode 100644
index 00000000000..a0bf7303557
--- /dev/null
+++ b/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.json
@@ -0,0 +1,79 @@
+{
+  "kind": "Event",
+  "apiVersion": "events.k8s.io/v1beta1",
+  "metadata": {
+    "name": "2",
+    "generateName": "3",
+    "namespace": "4",
+    "selfLink": "5",
+    "uid": "7",
+    "resourceVersion": "11042405498087606203",
+    "generation": 8071137005907523419,
+    "creationTimestamp": null,
+    "deletionGracePeriodSeconds": -4955867275792137171,
+    "labels": {
+      "7": "8"
+    },
+    "annotations": {
+      "9": "10"
+    },
+    "ownerReferences": [
+      {
+        "apiVersion": "11",
+        "kind": "12",
+        "name": "13",
+        "uid": "Dz廔ȇ{sŊƏp",
+        "controller": false,
+        "blockOwnerDeletion": true
+      }
+    ],
+    "finalizers": [
+      "14"
+    ],
+    "clusterName": "15",
+    "managedFields": [
+      {
+        "manager": "16",
+        "operation": "鐊唊飙Ş-U圴÷a/ɔ}摁(湗Ć]",
+        "apiVersion": "17",
+        "fieldsType": "18"
+      }
+    ]
+  },
+  "eventTime": "2482-03-20T23:11:25.602224Z",
+  "series": {
+    "count": -1971381490,
+    "lastObservedTime": "2429-02-18T17:57:56.343118Z"
+  },
+  "reportingController": "19",
+  "reportingInstance": "20",
+  "action": "21",
+  "reason": "22",
+  "regarding": {
+    "kind": "23",
+    "namespace": "24",
+    "name": "25",
+    "uid": "Ĩɘ.蘯6ċV夸eɑeʤ脽ěĂ",
+    "apiVersion": "26",
+    "resourceVersion": "27",
+    "fieldPath": "28"
+  },
+  "related": {
+    "kind": "29",
+    "namespace": "30",
+    "name": "31",
+    "uid": "蓏Ŋ",
+    "apiVersion": "32",
+    "resourceVersion": "33",
+    "fieldPath": "34"
+  },
+  "note": "35",
+  "type": "36",
+  "deprecatedSource": {
+    "component": "37",
+    "host": "38"
+  },
+  "deprecatedFirstTimestamp": "2964-12-12T12:04:40Z",
+  "deprecatedLastTimestamp": "2452-08-27T22:01:15Z",
+  "deprecatedCount": 1804227960
+}
\ No newline at end of file
diff --git a/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.pb b/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.pb
new file mode 100644
index 00000000000..fd873df6114
Binary files /dev/null and b/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.pb differ
diff --git a/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.yaml b/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.yaml
new file mode 100644
index 00000000000..254b836680b
--- /dev/null
+++ b/staging/src/k8s.io/api/testdata/v1.17.0/events.k8s.io.v1beta1.Event.after_roundtrip.yaml
@@ -0,0 +1,63 @@
+action: "21"
+apiVersion: events.k8s.io/v1beta1
+deprecatedCount: 1804227960
+deprecatedFirstTimestamp: "2964-12-12T12:04:40Z"
+deprecatedLastTimestamp: "2452-08-27T22:01:15Z"
+deprecatedSource:
+  component: "37"
+  host: "38"
+eventTime: "2482-03-20T23:11:25.602224Z"
+kind: Event
+metadata:
+  annotations:
+    "9": "10"
+  clusterName: "15"
+  creationTimestamp: null
+  deletionGracePeriodSeconds: -4955867275792137171
+  finalizers:
+  - "14"
+  generateName: "3"
+  generation: 8071137005907523419
+  labels:
+    "7": "8"
+  managedFields:
+  - apiVersion: "17"
+    fieldsType: "18"
+    manager: "16"
+    operation: 鐊唊飙Ş-U圴÷a/ɔ}摁(湗Ć]
+  name: "2"
+  namespace: "4"
+  ownerReferences:
+  - apiVersion: "11"
+    blockOwnerDeletion: true
+    controller: false
+    kind: "12"
+    name: "13"
+    uid: Dz廔ȇ{sŊƏp
+  resourceVersion: "11042405498087606203"
+  selfLink: "5"
+  uid: "7"
+note: "35"
+reason: "22"
+regarding:
+  apiVersion: "26"
+  fieldPath: "28"
+  kind: "23"
+  name: "25"
+  namespace: "24"
+  resourceVersion: "27"
+  uid: Ĩɘ.蘯6ċV夸eɑeʤ脽ěĂ
+related:
+  apiVersion: "32"
+  fieldPath: "34"
+  kind: "29"
+  name: "31"
+  namespace: "30"
+  resourceVersion: "33"
+  uid: 蓏Ŋ
+reportingController: "19"
+reportingInstance: "20"
+series:
+  count: -1971381490
+  lastObservedTime: "2429-02-18T17:57:56.343118Z"
+type: "36"
diff --git a/staging/src/k8s.io/api/testdata/v1.18.0/core.v1.Event.after_roundtrip.pb b/staging/src/k8s.io/api/testdata/v1.18.0/core.v1.Event.after_roundtrip.pb
new file mode 100644
index 00000000000..1f7bd435715
Binary files /dev/null and b/staging/src/k8s.io/api/testdata/v1.18.0/core.v1.Event.after_roundtrip.pb differ
diff --git a/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.json b/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.json
new file mode 100644
index 00000000000..a0bf7303557
--- /dev/null
+++ b/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.json
@@ -0,0 +1,79 @@
+{
+  "kind": "Event",
+  "apiVersion": "events.k8s.io/v1beta1",
+  "metadata": {
+    "name": "2",
+    "generateName": "3",
+    "namespace": "4",
+    "selfLink": "5",
+    "uid": "7",
+    "resourceVersion": "11042405498087606203",
+    "generation": 8071137005907523419,
+    "creationTimestamp": null,
+    "deletionGracePeriodSeconds": -4955867275792137171,
+    "labels": {
+      "7": "8"
+    },
+    "annotations": {
+      "9": "10"
+    },
+    "ownerReferences": [
+      {
+        "apiVersion": "11",
+        "kind": "12",
+        "name": "13",
+        "uid": "Dz廔ȇ{sŊƏp",
+        "controller": false,
+        "blockOwnerDeletion": true
+      }
+    ],
+    "finalizers": [
+      "14"
+    ],
+    "clusterName": "15",
+    "managedFields": [
+      {
+        "manager": "16",
+        "operation": "鐊唊飙Ş-U圴÷a/ɔ}摁(湗Ć]",
+        "apiVersion": "17",
+        "fieldsType": "18"
+      }
+    ]
+  },
+  "eventTime": "2482-03-20T23:11:25.602224Z",
+  "series": {
+    "count": -1971381490,
+    "lastObservedTime": "2429-02-18T17:57:56.343118Z"
+  },
+  "reportingController": "19",
+  "reportingInstance": "20",
+  "action": "21",
+  "reason": "22",
+  "regarding": {
+    "kind": "23",
+    "namespace": "24",
+    "name": "25",
+    "uid": "Ĩɘ.蘯6ċV夸eɑeʤ脽ěĂ",
+    "apiVersion": "26",
+    "resourceVersion": "27",
+    "fieldPath": "28"
+  },
+  "related": {
+    "kind": "29",
+    "namespace": "30",
+    "name": "31",
+    "uid": "蓏Ŋ",
+    "apiVersion": "32",
+    "resourceVersion": "33",
+    "fieldPath": "34"
+  },
+  "note": "35",
+  "type": "36",
+  "deprecatedSource": {
+    "component": "37",
+    "host": "38"
+  },
+  "deprecatedFirstTimestamp": "2964-12-12T12:04:40Z",
+  "deprecatedLastTimestamp": "2452-08-27T22:01:15Z",
+  "deprecatedCount": 1804227960
+}
\ No newline at end of file
diff --git a/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.pb b/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.pb
new file mode 100644
index 00000000000..fd873df6114
Binary files /dev/null and b/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.pb differ
diff --git a/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.yaml b/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.yaml
new file mode 100644
index 00000000000..254b836680b
--- /dev/null
+++ b/staging/src/k8s.io/api/testdata/v1.18.0/events.k8s.io.v1beta1.Event.after_roundtrip.yaml
@@ -0,0 +1,63 @@
+action: "21"
+apiVersion: events.k8s.io/v1beta1
+deprecatedCount: 1804227960
+deprecatedFirstTimestamp: "2964-12-12T12:04:40Z"
+deprecatedLastTimestamp: "2452-08-27T22:01:15Z"
+deprecatedSource:
+  component: "37"
+  host: "38"
+eventTime: "2482-03-20T23:11:25.602224Z"
+kind: Event
+metadata:
+  annotations:
+    "9": "10"
+  clusterName: "15"
+  creationTimestamp: null
+  deletionGracePeriodSeconds: -4955867275792137171
+  finalizers:
+  - "14"
+  generateName: "3"
+  generation: 8071137005907523419
+  labels:
+    "7": "8"
+  managedFields:
+  - apiVersion: "17"
+    fieldsType: "18"
+    manager: "16"
+    operation: 鐊唊飙Ş-U圴÷a/ɔ}摁(湗Ć]
+  name: "2"
+  namespace: "4"
+  ownerReferences:
+  - apiVersion: "11"
+    blockOwnerDeletion: true
+    controller: false
+    kind: "12"
+    name: "13"
+    uid: Dz廔ȇ{sŊƏp
+  resourceVersion: "11042405498087606203"
+  selfLink: "5"
+  uid: "7"
+note: "35"
+reason: "22"
+regarding:
+  apiVersion: "26"
+  fieldPath: "28"
+  kind: "23"
+  name: "25"
+  namespace: "24"
+  resourceVersion: "27"
+  uid: Ĩɘ.蘯6ċV夸eɑeʤ脽ěĂ
+related:
+  apiVersion: "32"
+  fieldPath: "34"
+  kind: "29"
+  name: "31"
+  namespace: "30"
+  resourceVersion: "33"
+  uid: 蓏Ŋ
+reportingController: "19"
+reportingInstance: "20"
+series:
+  count: -1971381490
+  lastObservedTime: "2429-02-18T17:57:56.343118Z"
+type: "36"