Zabbix

.......PS. [DEV-2481] fixed memory leak in json objects with duplicate keys

Merge in ZBX/zabbix from feature/DEV-2481-6.0 to release/6.0

* commit '09ab10cdaa2dd3d00a31b1024cb48d58f1a2f01a':
  .......PS. [DEV-2481] fixed memory leak in json objects and idendical keys

(cherry picked from commit b26ce9e6bf27f75dea035c987638962af9807417)