Item prototype Calculated

[cedric.marcoux]

Hello,

i'm trying to evolve the VMware ESX Standalone Template ans I have difficulties to create an item prototype calculated on Zabbix 3.4.7

Here are the working values:
The Discovery Rules:
Name: Datastore discovery
Type: Simple check
Key:

vmware.hv.datastore.discovery[{$URL},{$UUID}]

Working: Yes

The 2 items needed for my item prototype calculation:

Name: Free space on datastore $3
Type: Simple check
Key:

vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE},free]

Working: Yes

Name: Total size of datastore $3
Type: Simple check
Key:

vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE}]

Working: Yes

My calculated item prototype that is not working:

Name: Used space on datastore $3
Type: Calculated
Key:

vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE}]

Working: No
Formula:

last("vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE}]")-last("vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE},free]")

Errors: Cannot create item: Invalid first parameter "vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE}"

I have try several combination but cannot find the way to write the good formula...

Any help is welcome

[cedric.marcoux]

Hello, finally found myself, the trick was to add a ,0 to the last function

last("vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE}]",0)-last("vmware.hv.datastore.size[{$URL},{$UUID},{#DATASTORE},free]",0)