An Azure service that is used to collect, analyze, and act on telemetry data from Azure and on-premises environments.
I'm assuming you followed Add telemetry to your QnA Maker bot @nmt . If not, please have a look to ensure telemetry data is properly configured and view your property data through customEvents
customEvents
| where name == 'QnaMessage'
| extend MyImportantProperty = tostring(customDimensions.MyImportantProperty)
| summarize count() by MyImportantProperty