Update UPDATING.md

apache · Nov 15, 2022 · f046d23 · f046d23
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@@ -39,6 +39,8 @@ assists people when migrating to a new version.
 
 ### Potential Downtime
 
+- [21284](https://github.com/apache/superset/pull/21284): A change which drops the unused `dbs.allow_multi_schema_metadata_fetch` column via a (potentially locking) DDL operation.
+
 ### Other
 
 ## 2.0.0