Update adjust-resources.md

Adding ScalSun link to our documentation regarding horizontal scaling and allocation of resources.

sites/upsun/src/manage-resources/adjust-resources.md

@@ -213,6 +213,14 @@ title= From the Console
 
 {{< /codetabs >}}
 
+- **Alternative auto-scaling: :**
+
+**This is not an official product that will be supported by Upsun staff, but you can escalate issues directly on the repository in Github.**
+
+This auto-scaling mechanism is based on the Upsun CLI.
+Go to the Upsun github organization to download [ScalSun](https://github.com/upsun/scalsun) on your project to be able to configure CPU, RAM thresholds above or under which
+an API call will be automatically triggered to horizontally scale your application or worker, based on what you will have specified.
+
 
 ## Advanced: Container profiles