Trigger if X is less than Y assistance

[h4rri]

Hi,

Running Zabbix 4.0.3 on Debian 9.

After a recent data loss I now monitor the contents of key drives/folders and gather this via SNMP into Zabbix. I am looking to create a trigger to report if there is a decrease in the current value compared to the previous value.

If I am reading the documentation correctly the following should achieve this:

{10.1.1.1rive1.last()}<{10.1.1.1rive.last(#1)}

But doesn't. Any thoughts? Ideally I would also like an additional trigger of "if the value has decreased by 10%" then I can send a more focused notification.

[Engraf]

https://www.zabbix.com/documentation...gers/functions

Take note that #num works differently here than with many other functions.
For example:
last() is always equal to last(#1)
last(#3) - third most recent value (not three latest values)