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What version of Tableau Server are you using? It looks like the "view_metrics_aggregations" table doesn't show up in the guide until version 9.3. I checked in version 9.2 and that table doesn't appear to be listed - http://onlinehelp.tableau.com/v9.2/server/en-us/help.htm
Hope this helps!
Aaaah this must be it. I think we are on 9.2. This would explain why. I will double check to make sure we are on this version but I think your answer is spot on!
Thanks a lot!