You're assuming that two disks that have the same capacity, are the same
disk. You can't be sure that's true. The way you tell two metrics apart
is that they have different labels, not different values.
What I *think* is going on is you have a load of alias mounts, where an
existing filesystem is aliased under /home/virtfs/fld. So I'd suggest you
simply filter those out, to leave the real filesystems.
Unfortunately you don't have a filesystem mount type label (perhaps you
could fix the exporter to include this?), but until then you could do:
vmware_vm_guest_disk_capacity{partition!~"/home/virtfs/.*|/var/tmp"}
(on the assumption /var/tmp is an alias of /tmp, although again I can't be
sure of that; it could be two separate disks of identical size). Then you
can extend it to:
vmware_vm_guest_disk_capacity{partition!~"/home/virtfs/.*|/var/tmp"} -
vmware_vm_guest_disk_free
You don't need to repeat the label filter: the subtraction only operates
between two series with exactly the same set of labels.
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