Existing aggregate functions are not always useful in a real-time dashboard. Take for example a dashboard that wants to track current speed of a connected car, or current call queue in a call-centre dashboard. At the moment, it's not possible to have a callout that achieves this as MIN, MAX, AVG would not make sense. A function such as TOP to display only the latest value should be made available. NOTE: This should not require a date field to implement but should simply display the latest value received.
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