Zabbix

.......PS. [ZBX-18487] increased trapper verbosity for DebugLevel=4 when rejecting sender data

Merge in ZBX/zabbix from feature/ZBX-18487-4.0 to release/4.0

* commit '80685922dfc78740807007555e85040c1edb1de4':
  .......PS. [ZBX-18487] fixed comments
  .......PS. [ZBX-18487] added validation error log
  .......PS. [ZBX-18487] added more verbose information to trapper when rejecting sender data