Could you please provide a screenshot of the item configuration, including preprocessing tab? There may be additional data filtering present.

'Mounted filesystem discovery' discovery rule uses Filters for LLD macros {#FSNAME} and {#FSTYPE} controlled with user macro on the template level {$VFS.FS.FSNAME.MATCHES}, {$VFS.FS.FSTYPE.MATCHES}, {$VFS.FS.FSNAME.NOT_MATCHES}, {$VFS.FS.FSTYPE.NOT_MATCHES}.

even they exists in agent vfs.fs.get output.

You need to fix template configuration. More on LLD/Filter:
https://blog.zabbix.com/lld-filtering-with-macros/24959/

Please be advised that this section of the tracker is for bug reports only. The case you have submitted can not be qualified as one, so please reach out to [email protected] for commercial support (https://zabbix.com/support) or consultancy services. Alternatively, you can also use our community channels (https://www.zabbix.com/community) for assistance. With that said, we are closing this ticket. Thank you for understanding.

Dear all, case is closed. I will provide the screenshots asap but could you please re-activate the case ?

thank you.

Here are the macros list as Alexei Vladishev wanted

Here are the macros of host.

Closing Won't fix, based on the reporters' comment above.