Zabbix

.......PS. [ZBXNEXT-7604] added functionality to ignore NaN in Prometheus preprocessing aggregate functions

Merge in ZBX/zabbix from feature/ZBXNEXT-7604-6.0 to release/6.0

* commit '451a2507e516b9f6af93a71560b4f97b94cd4599':
  .......PS. [ZBXNEXT-7604] fixed comment
  .......PS. [ZBXNEXT-7604] fixed error message
  .......PS. [ZBXNEXT-7604] fixed after review
  .......PS. [ZBXNEXT-7604] coding style
  .......PS. [ZBXNEXT-7604] added functionality to ignore NaN in Prometheus preprocessing aggregate functions