Setting up a windows c drive low disk item and trigger in Zabbix 6.4

[Beveridge]

I had this item / trigger setup in an older version of zabbix (4.4)

item expression

vfs.fs.size[c:,pfree]

trigger expression
{Windows by Zabbix agent:vfs.fs.size[c:,pfree].last(0)}<5

that used to alert when a machine is down to 5% free space. I can add the item into the existing template I have applied to all my windows machines (Windows by Zabbix agent) but the trigger says the expression is incorrect. Did Zabbix change how it does expressions for low disk?

[tim.mooney]

It's documented in 5.4 (when it happened), as well as 6.0 (since many sites skip the X.4 releases and may not know what was new in that release) and in the Zabbix blog.

https://www.zabbix.com/documentation/5.4/en/manual/introduction/whatsnew540#new-expression-syntax-for-triggers-and-calculated-items

https://blog.zabbix.com/whats-new-in-zabbix-5-4/14603/