This file is indexed.

/etc/nagios3/conf.d/services_nagios2.cfg is in nagios3-common 3.5.1-1ubuntu1.3.

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 that web services are running
define service {
        hostgroup_name                  http-servers
        service_description             HTTP
 	check_command                   check_http
        use                             generic-service
	notification_interval           0 ; set > 0 if you want to be renotified
}

# check that ssh services are running
define service {
        hostgroup_name                  ssh-servers
        service_description             SSH
	check_command                   check_ssh
        use                             generic-service
	notification_interval           0 ; set > 0 if you want to be renotified
}