Просто он же у меня в хост прокидывается. ВМ типа все 8ГБ жрет, хотя оно просто кэш держит
on any virtualisation, your guest VM will use the ram allocated due to file caching in ram. Every modern OS caches in ram but when you look at the ram usage say htop on the vm, it will report its active usage but not cached, instead look for the Free ram and it will usually be very low
https://forum.proxmox.com/threads/over-60-of-ram-usage-on-idle-vms.98580/
And the PVE graph is correct. 99% of your physical RAM is used with just 81MB free. But thats no problem because PVE can free up 6.7GB of its used RAM (thats what "available" means) if needed by processes or guests.