WARNING
The new system monitor does not appear to like mounted NAS.
I have a samba share mount to my NAS (I have two - one is for the backups and the other for a general share).
The new integration loaded but failed to bring up all the entities correctly, with nothing showing in the integration settings. Error in the logs as per this post
https://community.home-assistant.io/t/2024-1-happy-automating/665947/202?u=biscuit
BlockingIOError: [Errno 11] Resource temporarily unavailable: ‘/share/NAS’
Solution - delete the NSA mount and reboot.