This file is indexed.

/usr/share/nagios-plugins/templates-standard/dns.cfg is in nagios-plugins-standard 1.4.15-5ubuntu3.

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

The actual contents of the file can be viewed below.

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# 'check_dns' command definition
define command{
	command_name	check_dns
	command_line	/usr/lib/nagios/plugins/check_dns -H www.google.com -s '$HOSTADDRESS$'
}

# 'check_dig' command definition
define command{
	command_name    check_dig
	command_line    /usr/lib/nagios/plugins/check_dig -H '$HOSTADDRESS$' -l '$ARG1$'
}