I made the rookie mistake of recreating a data extract instead of just updating/refreshing it. Now my "Number of Records" field has been deleted. I tried creating a calculated field (count of unique values in a key field) but it doesn't give me the same options (something as basic as SUM), and this has blown away two of my visualizations. Assistance please?
I created a new calc field with "1" as the calculation. That seems to be working better than my previous version where I tried a much more elaborate method. Simplicity... Anyway, now the only "problem" remaining is that the new field doesn't show up in the list of measures where I'd expect. A small annoyance.