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Change Request
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    Resolution: Fixed
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Trivial
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    None
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    3.0.3, 3.2.0alpha1
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    None
 
Documentation here
https://www.zabbix.com/documentation/3.0/manual/api/reference/event/object
refers to value_changed (at bottom)
This field was removed in v2.2 as part of ZBXNEXT-1574