/etc/cron.d/maas-import-isos is in maas 0.1+bzr482+dfsg-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Runs maas-import-isos every Sunday at 4am
# This will get the new mini.iso and generate a new cobbler profile
11 4 * * 0 root /usr/sbin/maas-import-isos &> /dev/null
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