By default, OpManager manages all the discovered devices. However, there might be some known devices that are under maintenance and hence cannot respond to status polls sent by OpManager. These devices can be set to unmanaged status to avoid unnecessary polling. Once maintenance gets over, they can be set to managed status.
This stops the status polling and data collection for the device and changes the device status icon to grey.
This resumes the status polling and data collection for the device. The status icon shows the current status of the device.