missing key when making a full clone

[Aleksei Mers]

Hello!

I need to make a full clone of one of my hosts. When a try, I get the following:

• Missing key "vfs.fs.size[/,free]" for host "new host".
• Skipped copying of graph "Disk space usage" to host "new host".

There is such a key and graph on the parent host, but I cannot understand why it is missing on a target new host, where is should just be created.