with anything else than syncing configuration text files. Syncing binary
files were never supported, but rumors say that some users do so.
+This is now prohibited and logged.
+
+```
+[2019-08-02 16:03:19 +0200] critical/ApiListener: Ignoring file '/etc/icinga2/zones.d/global-templates/forbidden.exe' for cluster config sync: Does not contain valid UTF8. Binary files are not supported.
+Context:
+ (0) Creating config update for file '/etc/icinga2/zones.d/global-templates/forbidden.exe'
+ (1) Activating object 'api' of type 'ApiListener'
+```
+
Such binaries wrapped into JSON-RPC cluster messages may always cause changes
and trigger reload loops. In order to prevent such harm in production,
use infrastructure tools such as Foreman, Puppet, Ansible, etc. to install