This file is indexed.

/usr/share/nagios-plugins/templates-basic/telnet.cfg is in nagios-plugins-basic 1.5-3ubuntu1.

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# 'check_telnet' command definition
define command{
	command_name	check_telnet
	command_line	/usr/lib/nagios/plugins/check_tcp -H '$HOSTADDRESS$' -p 23 '$ARG1$'
	}

####
# use these checks, if you want to test IPv4 connectivity on IPv6 enabled systems
####

# 'check_telnet_4' command definition
define command{
        command_name    check_telnet_4
        command_line    /usr/lib/nagios/plugins/check_tcp -H '$HOSTADDRESS$' -p 23 -4 '$ARG1$'
        }