docs(UPDATING): Adding downtime for #16756 (#17293)

Co-authored-by: John Bodley <4567245+john-bodley@users.noreply.github.com>
apache · Oct 30, 2021 · 79ed0ae · 79ed0ae
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@@ -31,6 +31,8 @@ assists people when migrating to a new version.
 
 ### Potential Downtime
 
+- [16756](https://github.com/apache/incubator-superset/pull/16756): a change which renames the `dbs.allow_csv_upload` column to `dbs.allow_file_upload` via a (potentially locking) DDL operation.
+
 ### Deprecations
 
 ### Other