I have update HASSIO OS and system monitor is return to work.
for me, the entities are back, but all unavailable 
Hi, Just FYI
This morning I had a similar warning after upgrading to core 2024.1.2 and OS 11.4
The system monitor integration was added and the resources that I had defined were still working. However indeed if you look at the entities of the integration, everything seems to be disabled/unavailable. However that is in line with the integration documentation that states: All entities are disabled by default, you need to enable the entities that you wish to use.
I have removed the entries from configuration and the restarted home assistant.
(maybe reloading the config would have been enough)
For me the sensors which I had in the dashboard (like cpu usage and temp + disk usage numbers) were still working.
Looking in the list of entities I found all the ones I had in my config file enabled automatically (completely at the bottom of the list).
Next I have enabled the system_monitor_swap_ entities by selecting them and clicking ´enable selected’ (at the top of the screen).
After a few minutes the entities were available for use and showing values. 
RPI 4 / 2GB
- Core 2024.1.2
- Supervisor 2023.12.0
- Operating System 11.4
hoo I missed the enable button, yeah that was the issue for me too.
Thanks!
Hi,
I am getting the exact same thing. The only options I have are those 5 sensors, all of which are meaningless. Did you ever get this fixed?
All running fine now.
From memory, it was a a bug in one of January’s early releases and fixed one or two releases later.
I think there is an issue with display of the entities. I have done dołowi g:
- install integration
- go to entities
- tap entity where it shows „disabled” (it may not show as you can see on the screenshot, tap anyway):
- tap settings „gear” icon:
- you get this screen where you can tap „enable”:
- tap „update”
Done:
J
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