The site monitoring robot only registers problems with the health of a website. You can view information about detected errors in the Monitoring Results report.
The report shows the time when an error was detected and the response code from your server to the robot's request. User Agent for the robot that checks website availability — Mozilla/5.0 (compatible; YandexMetrika/2.0; +http://yandex.com/bots).
Site availability is tested by a distributed system of robots, and reports are generated based on data from the group of tests by the distributed monitoring system.