Log a warning if there are more than 2 zone endpoint members

fixes #12222

lib/remote/zone.cpp

@@ -21,6 +21,7 @@
 #include "remote/zone.tcpp"
 #include "remote/jsonrpcconnection.hpp"
 #include "base/objectlock.hpp"
+#include "base/logger.hpp"
 #include <boost/foreach.hpp>
 
 using namespace icinga;
@@ -121,3 +122,14 @@ Zone::Ptr Zone::GetLocalZone(void)
 	return local->GetZone();
 }
 
+void Zone::ValidateEndpointsRaw(const Array::Ptr& value, const ValidationUtils& utils)
+{
+	ObjectImpl<Zone>::ValidateEndpointsRaw(value, utils);
+
+	if (value && value->GetLength() > 2) {
+		Log(LogWarning, "Zone")
+		    << "The Zone object '" << GetName() << "' has more than two endpoints."
+		    << " Due to a known issue this type of configuration is strongly"
+		    << " discouraged and may cause Icinga to use excessive amounts of CPU time.";
+	}
+}

lib/remote/zone.hpp

@@ -48,6 +48,9 @@ public:
 
 	static Zone::Ptr GetLocalZone(void);
 
+protected:
+	virtual void ValidateEndpointsRaw(const Array::Ptr& value, const ValidationUtils& utils) override;
+
 private:
 	Zone::Ptr m_Parent;
 	std::vector<Zone::Ptr> m_AllParents;