/etc/cloud/cloud.cfg.d/00_debian.cfg is in cloud-init 0.7.9-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | syslog_fix_perms: root:adm
mount_default_fields: [~, ~, 'auto', 'defaults,nofail', '0', '2']
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