Since the location of the configuration drop-in directory can vary by
distribution, it is important to expand the `zbx_agent_config_dir`
variable in the `Include` parameter.
The *zabbix-agent* role installs the Zabbix monitoring agent on the
managed node, and sets it up to communicate with the Zabbix server
specified by the `zabbix_server` variable. This role "should" be
compatible with most distributions; it has been tested with Fedora and
Gentoo.
