| Critical | The service is unreachable or unusable. For example, two consecutive heartbeats of an HTTPS monitor failed. |
| High | Impact on the service related to the incident is noticeable and requires action. |
| Medium | This severity is important, but does not immediately impact service availability. It is assigned to incidents such as a certificate expiring in 14 days. |
| Low | Events that happened, but do not impact service availability directly. For example when a certificate change was detected. |
| None | Purely informational, used by i.e. resolved notifications. |