Caculate items from different hosts

[varvsn]

Hello,

I have a question about visualisation of total network traffic from a couple of hosts.
All hosts have an own item "net.if.in[eth0,bytes]"
How I can create a graph with total sum of these items ?
Thanks for answer.

[aib]

You have a couple of options.
1) Create "Stacked" graph and include all individual Items in graph. You will have all Items value in legend and total graph.
2) Create one Calculated Item in any of hosts and construct the formula which includes all Items from all Hosts. Then you can create a graph for this Item.

[varvsn]

Thanks for the answer, Alexey!

I try to create calculated item with formula

host1:last(net.if.in[eth0,bytes])+host2:last(net.if.in[eth0,bytes])

What I need to type in "key" position of this item?

[aib]

It will be your own choice.
You can call it "total_in_eth0_on_host0_host1"
It's only has to be different from other keys.

[varvsn]

The real working formula:

last("host1:net.if.in[eth0,bytes]")+last("host2:net.if.in[eth0,bytes]")

[Satur]

This is a working Formula field value for Zabbix 6 to calculate download speed for multiple hosts

last(/host-name-1/net.if.in["enp4s0"]) + last(/host-name-2/net.if.in["enp4s0"])