Shutting Down Cluster Hosts During Builds
You can remove agent machines from the cluster during a build without requiring downtime or disabling Agents in the Cluster Manager, with the following advisories:
If possible, shut down Agents before rebooting agent machines. Not shutting down Agents before a reboot might cause commands to fail unexpectedly, which could manifest in spurious build failures.
After rebooting, agent machines that automatically start Agents will connect to the Cluster Manager and will be assigned builds and so on.