/usr/share/maas/maas-rsyslog.conf is in maas-common 2.0.0~beta3+bzr4941-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Log MAAS messages to their own file.
:syslogtag,contains,"maas" /var/log/maas/maas.log
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