custom alerting use the same API group and flagset to alerting

Signed-off-by: junotx <junotx@126.com>

cmd/ks-apiserver/app/options/validation.go

@@ -34,7 +34,7 @@ func (s *ServerRunOptions) Validate() []error {
 	errors = append(errors, s.AuthorizationOptions.Validate()...)
 	errors = append(errors, s.EventsOptions.Validate()...)
 	errors = append(errors, s.AuditingOptions.Validate()...)
-	errors = append(errors, s.CustomAlertingOptions.Validate()...)
+	errors = append(errors, s.AlertingOptions.Validate()...)
 
 	return errors
 }