What option should be used if you cannot install Dynatrace OneAgent on the host?

Setting up agentless Real User Monitoring is the correct option when Dynatrace OneAgent cannot be installed on the host. Agentless Real User Monitoring allows you to monitor user interactions with web applications without needing to install any software on the host machine. This is particularly useful in scenarios where installation is not feasible due to permissions, technical limitations, or restrictive environments. It provides insights into user performance and behavior by capturing data directly from the browser, ensuring that monitoring capabilities are still available without the need for server-side agents.

Other alternatives, such as installing an alternative monitoring tool or utilizing manual code implementation, may provide some level of monitoring but do not specifically leverage Dynatrace's powerful analytics and reporting features. Accessing the host via remote desktop is not a solution for monitoring and does not address the need for real-time insights into application performance from the user's perspective. Using agentless Real User Monitoring maintains a focus on user experiences while bypassing the constraints of agent installation.