Which event type has the highest severity level?

Availability events represent the highest severity level because they directly impact the functionality and accessibility of applications and services. When an availability event occurs, it indicates that a service or application is down or is unable to meet the demands of its users. This can lead to significant disruptions for businesses, lost revenue, and a poor user experience, making it imperative to address these issues with urgency.

In contrast, performance events, infrastructure events, and user experience events, while still important, generally reflect issues that are less critical to immediate service availability. Performance events highlight degradation in response times or resource utilization, infrastructure events point to issues within the underlying hardware or network, and user experience events focus on how users perceive and interact with applications. However, these types of events do not necessarily halt access to services, which is why availability events are prioritized as the most severe.