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Question on renaming a field in a json event

anybody know how I would go about renaming a field "fields.metric_name" in a json event to the value of a different field that I've already concatenated what I need to be in the new field name? old name fields.metric_name=`metric_name:${object}.${collection}` but I need the new field to be fields.metric_name:System.Threads with a value of _value

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