I was so happy to see my RAM usage only was about 3% in my selfmade RAM sensor on my HA RPI 4 4GB
But then I saw the new system metrics display and here I can see what my sensor actually measured and that was not my Core RAM Usage apparently - but what is this Core RAM showing and is it “healthy” on my PI?
Core RAM is the RAM used by Home Assistant Core and Supervisor RAM is the RAM used by the Supervisor, these are two separate Docker Containers.
And yes, that’s healthy. Even if it were at 90%, unused RAM is wasted RAM if you don’t have any issues like your system getting slow or similar, then you don’t need to worry about it.