I'm running Kolab 16 on Debian 9. kolab-server is 0.8.16-0~kolab1
After the last update the following happens:
root@jupiter:/var/log# ls -l kolab/pykolab.log -rw-rw---- 1 kolab kolab-n 0 Nov 23 06:25 kolab/pykolab.log root@jupiter:/var/log# systemctl restart kolab-server.service root@jupiter:/var/log# ls -l kolab/pykolab.log --w--w-r-T 1 kolab kolab-n 3680 Nov 23 06:34 kolab/pykolab.log
There have been changes to umask an PID files, they might be relevant here too.