I really feel that the memory problem comes from the combination of ceph-osd + kernel > 6.8.12-11
In the tests I carried out in a virtual environment (three virtualised nodes on a single Proxmox node with an internal bridge), I did not use Intel 810 cards, yet I still observed a memory leak with Ceph 18.2.7 and Ceph 19.2.3.
I had a gradual increase in slab memory.