Upgraded to 0.19.2
Upgrade itself went OK. Also updated pict-rs to 0.5.1 which performed a metadata update.
I tested this upgrade last Thursday 2024-01-11 but rolled back when outgoing federation didn’t work.
Found a fix from matrix.org (thanks to Ategon@programming.dev and Illecors@lemmy.cafe) by updating the “updated” column on the instance table.
UPDATE instance SET updated = now() WHERE updated > now() - interval ‘14 days’;
Total downtime was 12 minutes.