Free Actual Microsoft Azure AZ-204 Actual Exam Questions - Question 11 Discussion
HOTSPOT You have an Azure App Service web app named App1. App1 has Application Insights enabled. You plan to review the configuration of telemetry sampling for Application Insights of App1. You need to author an analytics query that will return the sampling rate. How should you complete the provided query? To answer, select the appropriate options in the answer area. 
I think option B fits better since samplingRate is usually a top-level property in the traces or requests data. Filtering like in option D is useful but might miss where the sample rate is actually stored.
I’d add that checking for samplingPercentage inside customDimensions of the requests table works because that’s where Application Insights logs most request metadata, including sampling info. Other tables like traces won’t have this data consistently.
I’d pick “requests” as the table and then parse out samplingPercentage from the customDimensions JSON. That’s where App Insights usually stores sampling info in telemetry data.
I’d go with “requests” and then filter on customDimensions to get samplingPercentage. It makes sense since sampling info is stored in the telemetry’s custom properties, not in a separate table like traces or exceptions.
Looks like the sampling rate can be found using the customDimensions field in requests. So, I'd pick "requests" and then grab samplingPercentage from customDimensions.