There is problem when you try to get size of big folder (1TB in my case)
When you use SATA drives and folder contains a lot of files size measurement take some time, but zabbix already report a timeout issue in this situation.
We should have an option to set this timeout when we use vfs.dir.size

Problem screenshot included.

The actual full folder size is 686 GB with 68136 files.

I will test same on linux on our backup servers (SATA too), but on work week.