API: Harden default cipher list
The default global zones generated by the setup wizards are called `global-templates` and `director-global`.
+While you can should `global-templates` for your global configuration, `director-global` is reserved for use
+by [Icinga Director](https://icinga.com/docs/director/latest/). Please don't
+place any configuration in it manually.
+
Similar to the zone configuration sync you'll need to create a new directory in
`/etc/icinga2/zones.d`:
## Zone Includes <a id="zone-includes"></a>
+> **Note**
+>
+> This is an internal functionality consumed by Icinga itself.
+>
+> The preferred way for users managing configuration files in
+> zones is to use the [cluster config sync](06-distributed-monitoring.md#distributed-monitoring-top-down-config-sync)
+> or [REST API config packages](12-icinga2-api.md#icinga2-api-config-management).
+
The `include_zones` recursively includes all subdirectories for the
given path.