With the host power management workflows, you can reboot or shut down a host.

Reboot host
Reboots a host. If the Orchestrator client is connected directly to the host, it loses the connection to the host and does not receive an indication of success in the returned task.
Shut down host
Shuts down a host. If the Orchestrator client is connected directly to the host, it loses the connection to the host and does not receive an indication of success in the returned task.