I've got to an environment, where VMware Datastores have literally terabytes of free space.
The ZBX's template "VM VMware Hypervisor" with ITEM "Free space on datastore $3 (free)" with "Numeric (float)" works well if the values are in GB.
But if it finds free space with TB, the items switch to UNSUPPORTED with info: Value XYZ is too small or too large.
Where XYZ are various values like:
XYZ=3650579058688.000000
or
XYZ=2816659415040.000000
or
XYZ=4398136352768.000000
etc...

Workaround is, to switch the ITEM's "Type of information" to "Numeric (unsigned)".
Perhaps this is something to be fixed on a development level, that TB values would work with "Numeric (float)" as well.
It is also probable, that this issue will affect not only the datastores, but also another free spaces with item:"Numeric (float)", when it receives values in TB.