diff --git a/public/app/features/alerting/unified/utils/cloud-alertmanager-notifier-types.ts b/public/app/features/alerting/unified/utils/cloud-alertmanager-notifier-types.ts
index e8100e9aba9..9c45bac800d 100644
--- a/public/app/features/alerting/unified/utils/cloud-alertmanager-notifier-types.ts
+++ b/public/app/features/alerting/unified/utils/cloud-alertmanager-notifier-types.ts
@@ -322,8 +322,12 @@ export const cloudNotifierTypes: Array<NotifierDTO<CloudNotifierType>> = [
         'The maximum number of alerts to include in a single webhook message. Alerts above this threshold are truncated. When leaving this at its default value of 0, all alerts are included.',
         {
           placeholder: '0',
+          inputType: 'number',
           validationRule: '(^\\d+$|^$)',
-          setValueAs: (value) => (typeof value === 'string' ? parseInt(value, 10) : 0),
+          setValueAs: (value) => {
+            const integer = Number(value);
+            return Number.isFinite(integer) ? integer : 0;
+          },
         }
       ),
       httpConfigOption,