I think this is very convenient; you don't want to automatically upgrade a big database because you probably want to choose the downtime window. This is obvious

I think this is very convenient; you don't want to automatically upgrade a big database because you probably want to choose the downtime window. This is obviously by design, but I'd also like being able to automate the pg_upgradecluster pg_dropcluster process, specially for install-and-forget little databases. IMO, the biggest shock from the MSSQL/MYSQL to PostgreSQL migration was not having 1 or 2 specific files per database, specially if you used to backup the files instead of doing a formal database backup.