If you are upgrading from a Barman setup, be aware that destroying the Barman instance (which is required, as upgrading with it is not supported by the latest image) leaves a replication slot open on the primary instance. This causes the WAL files to grow, ignoring the max WAL size limit, until all free space on the primary is filled, putting it into read-only mode. This issue cost me several hours of downtime and a stressful Sunday.
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