The measurement
The machine calls your home page every 5 minutes. It checks the status code, the response time and one string that must be on the page. Mail is checked by connection port and DNS score. Each call writes one line to the log. A month holds about 8,640 lines per service.
When something fails
Three consecutive failures raise an alert. The alert appears on the on-duty staff screen and starts the downtime clock. Loss of web or mail is handled within 1 hour, day or night. Customers get a notice before they ask. It states the start time, the cause and the root fix.
When the target is missed
Any month below 99.5% earns a 10% credit on that month’s fee for each missing 0.5%. The credit is computed from the log, with no claim needed. The measured figure and the credit are printed together in the monthly report.