Which KQL query counts the number of failed HTTP requests (resultCode 5xx) in Application Insights over the last hour?
- A requests | where success == 'False' | count
- B requests | where timestamp > ago(1h) | where success == false | count (correct answer)
- C logs | filter statusCode >= 500 | count
- D requests | top 10 by duration
Shortcut: requests | where timestamp > ago(1h) | where success == false | count queries the requests table, filters to the last hour, filters on failed requests (success==false covers 4xx/5xx), and counts them.