Dell EMC storage version is unity 400 is supported with vnxe_monitor probe?
Release : 20.3 and later
Component : vnxe_monitor probe
Yes the full range of Dell EMC storage versions from Unity 300 - 600 and 350F - 650F are supported.
The complete Unity Range (from Unity 300 - 600 and 350F - 650F) are running the identical code.
The only difference here is the number of shelves being supported (and number of Disks) and CPU power.
So all Unity's are running identical Firmware, from the smaller versions 300 / 350F until the bigger version 600 / 650F.