add auto-compaction compatibility doc

Author: xx789633

website/docs/maintenance/operations/upgrading.md

@@ -83,4 +83,7 @@ The compatibility between the Fluss client and the Fluss server is described in
 |            | Server 0.6 | Server 0.7 | Limitations |
 |------------|------------|------------|-------------|
 | Client 0.6 | ✔️         | ✔️         |             |
-| Client 0.7 | ✔️         | ✔️         |             |
+| Client 0.7 | ✔️         | ✔️         |             |
+
+## Compatibility between Fluss datalake tiering service
+1. As of Fluss 0.8, the compaction work during datalake tiering is disabled by default. You can enable it by setting the parameter `table.datalake.auto-compaction` to `true`.