I noticed that
/usr/local/psa/var/log/maillog is not rotated on the Postfix service node.
/var/log/ppa/agent.log log on the Postfix service node the following error is shown:
[AGENT][INFO]: /usr/local/psa/admin/bin/statistics_collector [AGENT][INFO]: STATUS: FAILED, Exit code: 1
The issue is considered to be a software issue. Internal request ID TP-144345. The issue is fixed in PPA 11.5
Backup original file on the service node:
~# cp /usr/local/psa/admin/sbin/statistics_collector /usr/local/psa/admin/sbin/statistics_collector.orig
Download attached fix and replace
/usr/local/psa/admin/sbin/statistics_collectorfile with it.