Zabbix

.......PS. [ZBX-17694] fixed high memory consumption when using dependent items

* commit 'f28d93cb4534ccacbdd279cb379eea79eb63a47d':
  .D........ [ZBX-17694] added ChangeLog entry
  .......PS. [ZBX-17694] improved result pool not to use hashset
  .......PS. [ZBX-17694] added comment
  .......PS. [ZBX-17694] fixed preprocessing of logs
  .......PS. [ZBX-17694] removed redundant indentation
  .......PS. [ZBX-17694] check if null result is received
  .......PS. [ZBX-17694] added const
  .......PS. [ZBX-17694] fixed comment
  .......PS. [ZBX-17694] added result pool
  .......PS. [ZBX-17694] added result pool
  .......PS. [ZBX-17694] merged with 4.0