Add changelog entry

Author: pedrosousa

src/content/changelogs/page-shield.yaml

@@ -5,6 +5,11 @@ productLink: "/page-shield/"
 productArea: Application security
 productAreaLink: /fundamentals/reference/changelog/security/
 entries:
+  - publish_date: "2024-12-02"
+    title: Alerts based on customer-defined policies
+    description: |-
+      You can now scope all Page Shield's alert types to selected zones and their associated policies, alerting only on the resources that have been explicitly allowed.
+
   - publish_date: "2024-09-30"
     title: New machine learning (ML) scores for detected scripts
     description: |-