Site availability is tested by a distributed system of robots, and reports are formed based on data from a group of tests in the distributed monitoring system. For more information about the reports, see the section Check results.
If the site is unavailable, monitoring is disabled for 10 days. When monitoring is disabled, a notification message is sent to the email address that you entered when you subscribed to notifications. In this case, you can re-subscribe.
User-agent: Mozilla/5.0 (compatible; YandexMetrika/2.0; +http://yandex.com/bots)
In some cases, the server settings forbid accepting requests from unknown User Agents or certain IP addresses. This may trigger false notifications about site unavailability. You can find information about errors detected by monitoring in the Results report.