Zabbix

.......PS. [ZBXNEXT-9877] added zabbix[preprocessing] internal item

* commit 'ae523aaa8674160efd4667fef897d4cabffa99d9':
  .......PS. [ZBXNEXT-9877] fixed variable initialization
  .......PS. [ZBXNEXT-9877] simplified preprocessor_add_size_json()
  .......PS. [ZBXNEXT-9877] fixed '-R diaginfo=preprocessing'
  .......PS. [ZBXNEXT-9877] fixed parameter check
  .......PS. [ZBXNEXT-9877] added zabbix[preprocessing] internal item