This file is indexed.

/etc/nagios3/conf.d/hostgroups_nagios2.cfg is in nagios3-common 3.2.3-3ubuntu1.

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

The actual contents of the file can be viewed below.

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# Some generic hostgroup definitions

# A simple wildcard hostgroup
define hostgroup {
        hostgroup_name  all
		alias           All Servers
		members         *
        }

# A list of your Debian GNU/Linux servers
define hostgroup {
        hostgroup_name  debian-servers
		alias           Debian GNU/Linux Servers
		members         localhost
        }

# A list of your web servers
define hostgroup {
        hostgroup_name  http-servers
		alias           HTTP servers
		members         localhost
        }

# A list of your ssh-accessible servers
define hostgroup {
        hostgroup_name  ssh-servers
		alias           SSH servers
		members         localhost
        }