google translate :

Not possible to select the key "zabbix [requiredperformance]" through WEB-interface for configuration of the element type "zabbix_internal", since it is not in the drop-down menu.
At the same time, if the field "Key" as a key point in "zabbix [requiredperformance]" (type hands), the element data collected.

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original :

?? ???????? ??????? ???? "zabbix[requiredperformance]" ????? WEB-????????? ??? ???????????????? ???????? ? ????? "zabbix_internal", ??? ??? ?? ??????????? ? ?????????? ????.
? ?? ?? ???, ???? ? ???? "Key" ??????? ? ???????? ????? "zabbix[requiredperformance]" (????? ??????), ?? ??????? ?????? ????????.