events: ensure the name is valid

The event Object is created from the referenced Object name, however,
there is no guarantee that the name from the referenced Object will be a
valid Event Name.

For those Objects with name not valid for an Event, generate a new valid
name using an UUID.

Kubernetes-commit: ee36b817df06f84ce1a48ef4d65ed559c3775404

tools/record/util/util_test.go

@@ -0,0 +1,72 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"strings"
+	"testing"
+
+	apimachineryvalidation "k8s.io/apimachinery/pkg/api/validation"
+)
+
+func TestGenerateEventName(t *testing.T) {
+	timestamp := int64(105999103295324396)
+	testCases := []struct {
+		name     string
+		refName  string
+		expected string
+	}{
+		{
+			name:     "valid name",
+			refName:  "test-pod",
+			expected: "test-pod.178959f726d80ec",
+		},
+		{
+			name:    "invalid name - too long",
+			refName: strings.Repeat("x", 300),
+		},
+		{
+			name:    "invalid name - upper case",
+			refName: "test.POD",
+		},
+		{
+			name:    "invalid name - special chars",
+			refName: "test.pod/invalid!chars?",
+		},
+		{
+			name:    "invalid name - special chars and non alphanumeric starting character",
+			refName: "--test.pod/invalid!chars?",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			actual := GenerateEventName(tc.refName, timestamp)
+
+			if errs := apimachineryvalidation.NameIsDNSSubdomain(actual, false); len(errs) > 0 {
+				t.Errorf("generateEventName(%s) = %s; not a valid name: %v", tc.refName, actual, errs)
+
+			}
+
+			if tc.expected != "" && (actual != tc.expected) {
+				t.Errorf("generateEventName(%s) returned %s expected %s", tc.refName, actual, tc.expected)
+			}
+
+		})
+
+	}
+}