Which of the following is NOT a service monitored by Host Units in Dynatrace?

In Dynatrace, Host Units primarily monitor performance metrics related to the infrastructure and services running on host machines. This includes monitoring resources like virtual machines, web applications, and print servers, which directly relate to the physical or virtual resources that are part of the host environment.

User sessions, however, pertain to the interactions users have with applications rather than a service running on a host. They are more focused on the end-user experience and application performance from a user-centric perspective. This means that, while user sessions are important for understanding application performance, they do not fall under the services monitored at the host level, as they do not represent a standalone service or resource that resides on a host unit.

Therefore, the distinction lies in the type of monitoring: host units focus on the operational and resource metrics of the servers and applications running directly on them, whereas user sessions are tied to application-level analytics and user engagement, not the underlying host infrastructure. This clearly places user sessions outside the scope of what Host Units monitor in Dynatrace.