The Device View > Show History > Reboot needed shows only the date and time when the reboot needed flag was set. However after restarting the system it´s not obvious that this status is gone.
There is the "Reboot needed" status in the device overview, but that status seemed to not update properly with the true system status. It would be great to have a way to truly follow the history (yes and no) of the reboot needed status.
