[Cache] Adds information about normalization

src/content/docs/cache/how-to/cache-keys.mdx

@@ -34,6 +34,10 @@ Custom cache keys let you precisely set the cacheability setting for any resourc
 7. You can also select settings for **Headers**, **Cookie**, **Host**, and **User**.
 8. To save and deploy your rule, select **Deploy**. If you are not ready to deploy your rule, select **Save as Draft**.
 
+:::note
+When [URL normalization](/rules/normalization/) is enabled, we recommend also enabling [Normalize URLs to origin](/rules/normalization/manage/), especially if you are setting custom cache keys or using cache by device type, which also modifies the cache key. This helps ensure the URL in the cache key matches the URL sent to the origin, preventing cache poisoning and ensuring consistent behavior.
+:::
+
 ## Cache Key Template
 
 There are a couple of common reasons to change the Cache Key Template. You might change the Cache Key Template to:

src/content/docs/cache/how-to/cache-rules/settings.mdx

@@ -188,6 +188,10 @@ Enterprise customers have these additional options for custom cache keys:
 - In the **Cookie** section, you can include cookie names and their values, and check for the presence of another cookie.
 - In the **Host** section, you can select **Use original host** and **Resolved host**. In the **User** section, you can select **Device type**, **Country**, and **Language**. Using **Resolved host** means the cache key will contain whatever hostname was used to resolve the origin IP which can be different depending on whether the [resolve override](/rules/origin-rules/features/#dns-record) feature is on or not.
 
+:::note
+When [URL normalization](/rules/normalization/) is enabled, we recommend also enabling [Normalize URLs to origin](/rules/normalization/manage/), especially if you are setting custom cache keys or using cache by device type, which also modifies the cache key. This helps ensure the URL in the cache key matches the URL sent to the origin, preventing cache poisoning and ensuring consistent behavior.
+:::
+
 <Details header="API information">
 
 API configuration object name: `"cache_key"`.