Reshape webhook payload

1. Remove alert.title, alert.message, alert.image_url from webhook payload, they are deprecated.
2. Pass alert_group_id to webhook payload.

engine/apps/alerts/models/custom_button.py

@@ -118,11 +118,8 @@ class CustomButton(models.Model):
         elif self.data:
             rendered_data = Template(self.data).render(
                 {
-                    "alert_title": self._escape_string(alert.title),
-                    "alert_message": self._escape_string(alert.message),
-                    "alert_url": alert.link_to_upstream_details,
                     "alert_payload": self._escape_alert_payload(alert.raw_request_data),
-                    "alert_payload_json": json.dumps(alert.raw_request_data),
+                    "alert_group_id": alert.group.public_primary_key,
                 }
             )
             post_kwargs["json"] = json.loads(rendered_data)

grafana-plugin/src/containers/OutgoingWebhookForm/OutgoingWebhookForm.config.ts

@@ -36,7 +36,7 @@ export const form: { name: string; fields: FormItem[] } = {
       name: 'data',
       getDisabled: (form_data) => Boolean(form_data.forward_whole_payload),
       type: FormItemType.TextArea,
-      description: 'Available variables: {{ alert_title }}, {{ alert_message }}, {{ alert_url }}, {{ alert_payload }}',
+      description: 'Available variables: {{ alert_payload }}, {{ alert_group_id }}',
       extra: {
         rows: 9,
       },