@paul Thanks Paul for reminding me to do the same. Went from 7 to 6.5 GB so not much gain here. However, I found that after my recent Ubuntu 20.04 --> 22.04 upgrade, I was having this issue:
Collation version mismatch
I replicated a database, it's working fine but when I enter the replication database it displays the following message: The database was created using collation version 2.31, but the operating sys...
Database Administrators Stack Exchange (dba.stackexchange.com)
Mastodon was working perfectly, but the VACUUM was spitting out these messages. The REINDEX and ALTER DATABASE commands from the link solved the issue and the in a second try the VACUUM ran without any issues.