Agentless Devices: Navigate to ‘Settings → Node Operations → Deleted Devices’ and select the respective device and click on ‘Add to Monitor’. This will internally initiate a rediscovery process of the device to make it managed devices. If required prerequisite not met, then it will move to unmanaged devices
Agent Device: ‘Add to Monitor’ option may not work for agent- based devices as we don’t know if the agent is uninstalled/reinstalled in the end point.