This file is indexed.

/etc/cron.d/munin-node is in munin-node 2.0.25-1+deb8u3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# cron-jobs for munin-node
#

MAILTO=root

# If the APT plugin is enabled, update packages databases approx. once
# an hour (12 invokations an hour, 1 in 12 chance that the update will
# happen), but ensure that there will never be more than two hour (7200
# seconds) interval between updates..
*/5 * * * *	root if [ -x /etc/munin/plugins/apt_all ]; then /etc/munin/plugins/apt_all update 7200 12 >/dev/null; elif [ -x /etc/munin/plugins/apt ]; then /etc/munin/plugins/apt update 7200 12 >/dev/null; fi