Edit vfs.fs.size trigger NOT to go off for disk C:

[pportnoy]

Hello!
I have a default trigger: "Free disk space is less than 10% on volume {#FSNAME}"
It looks like:

{Template OS Windows:vfs.fs.size[{#FSNAME},pfree].last(0)}<10

I'd like that trigger not to alarm me when it's disk "C:"

I've tried to edit it like:

{Template OS Windows:vfs.fs.size[{#FSNAME},pfree].last(0)}<10&{#FSNAME}#"C:"

, but it gave me an error:
Incorrect host name "#FSNAME" provided in expression. Check expression part starting from "{Template OS Windows:vfs.fs.size[{#FSNAME},pfree].last(0)}<10&{#FSNAME}#"C:"".

How can I realise what's needed? Thank you!

[BDiE8VNy]

LLD Macros can be used for [...]triggers, in names and expressions[...] only (See: Low-level discovery).

I encountered a similar problem some time ago and solved it by adding an additional item prototype that holds the necessary information.
Find a way to provide an item that gets {#FSNAME} as argument and returns the information that you need.

In worst case add a custom item similar to:

UserParameter=echo[*],echo $1

Then make an item prototype like:

echo["{#FSNAME}"]

and a trigger prototype like:

{Template OS Windows:vfs.fs.size[{#FSNAME},pfree].last(0)}<10&{Template OS Windows:echo["{#FSNAME}"].regexp("^C:$")}=0

Just to show the idea. Haven't tested any of that.

[joel_leonhardt]

Adding to BDiE8VNy's excellent advice (use an additional item prototype), you can create a slightly different prototype that doesn't need a custom item added to each Zabbix agent config file.

Make the item prototype like this:

Item type: external check
Item key:  echo["{#FSNAME}"]

This uses the Zabbix server's ECHO command, so that must be available as an external check:

ZabbixServer> ln /bin/echo /usr/share/zabbix/externalscripts/
(directories may be different on your system)

We have just done this ourselves (basing our work on BDiE8VNy's original answer), so it's been tested under Zabbix v2.0.4.