Add a note to the docs on >2 endpoints in a zone

This is missing, I cannot remember how it went away.
Questions are coming frequently recently.

diff --git a/doc/06-distributed-monitoring.md b/doc/06-distributed-monitoring.md
index bccac1fe960a298bb2795dfa1939618e26da8488..8bd68d9ffd313d07ebd9a899032884ea3bd375bf 100644 (file)
--- a/doc/06-distributed-monitoring.md
+++ b/doc/06-distributed-monitoring.md
@@ -109,6 +109,12 @@ information, e.g. if the master should actively try to connect to a client.
 The zone membership is defined inside the `Zone` object definition using
 the `endpoints` attribute with an array of `Endpoint` names.
 
+> **Note**
+>
+> There is a known [problem](https://github.com/Icinga/icinga2/issues/3533)
+> with >2 endpoints in a zone and a message routing loop.
+> The config validation will log a warning to let you know about this too.
+
 If you want to check the availability (e.g. ping checks) of the node
 you still need a [Host](09-object-types.md#objecttype-host) object.