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Impala query memory usage chart not showing data


I'm trying to build a chart which shows physical memory usage by impala query. 

Chart builder - Toggle Help & Examples - List of Metrics - Impala Query - Memory Usage. 

Chart shows NO Data (its a busy cluster for impala queries) but also only states "select memory_usage" 

Cloudera Enterprise 5.8.3


Is this a bug? If so, how can I complete the chart? I've tried select memory_usage where serviceName=impala with no luck.


Thank you 

impala chart.PNG