How does zabbix3.4 monitor the difference?

zabbix-server has been upgraded to 3.4, and it is found that the original "stored value" function is not available when configuring item:

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Preprocessingzabbix 3.4Delta per secondDeltaPreprocessingDelta per secondDelta:

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could you tell me where to configure it?

Sep.29,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3b22f-4d90a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b22f-4d90a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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