Fixes you need after upgrading Debian from 10 to 11

Warning

This is still a DRAFT document, it may miss some other important changes.

Dovecot

Please remove these lines from /etc/dovecot/dovecot.conf:

metric imap_command_finished {
    event_name = imap_command_finished
}

Newer Dovecot release has different syntax for metric. Since netdata doesn't support Dovecot-2.3 yet, we prefer removing it for now.

iRedAPD and iRedAdmin(-Pro)

Debian 11 offers newer Python release, few Python modules must be re-installed:

pip3 install -U web.py

Services must be restarted:

service iredapd restart
service iredadmin restart

php-fpm

Debian 11 ships php 7.4, but Debian 10 ships php 7.3. Although php7.4-fpm service is started by default after OS upgrade, but you still need to copy old php-fpm config file and restart php7.4-fpm service:

cp /etc/php/7.3/fpm/pool.d/www.conf /etc/php/7.4/fpm/pool.d/www.conf
service php7.4-fpm restart