How to deal with Ubuntu option 'su root rsyslog'

[dvandok]

Ubuntu systems run logrotate slightly differently; the log directories are group writable and have group ownership 'syslog', with the global directive

su root syslog

in logrotate.conf. This is overwritten by the formula and without the directive, logrotate refuses to rotate at all.
The default configuration file also rotates /var/log/btmp and /var/log/wtmp as no package owns these log files, but the salt formula overwrites these defaults.