setting Hostname and HostnameItem causes a warning on agentd start

[f0]

Hostname and HostnameItem are both set by default, this leads into this warning:

Shutting down Zabbix agent: [ OK ]
Starting Zabbix agent: zabbix_agentd [3912]: Warning: both Hostname and HostnameItem defined, using [xxx]

HostnameItem should not set by default, and Hostname should be disabled when HostnameItem is set

[f0]

one fix is to disable the HostnameItem when the Hostname is defined
<% if !@hostname -%>
HostnameItem=<%= @hostnameitem %>
<% end -%>

but the Hostname defaults to $fqdn, the HostnameItem is always disabled.
i think it should be no default for the hostname

hostname is not set -> defaults to hostnameItem (actual zabbix behaviour)
hostname is set -> hostname is used instead of HostnameItem (actual zabbix behaviour)