Calculated Item in Interface Discovery

[Behemoth]

Hi,

I’m trying to create a calculated item from values in interface discovery, but I haven’t really figured out how yet. I think the documentation is pretty clear, but somehow it isn’t working in my system. I’m running Zabbix 2.4.8.

So, I need to see incoming packets per second (pps) on all interfaces on a router. I have collected three values from my interface discovery rules: ifHCInBroadcastPkts, ifHCInMulticastPkts and ifHCInUcastPkts. These are working fine and I get data from each one. In order to get pps, I need to combine these into a new item.

So I created an Item Prototype in my discovery rules like this:

Name: {#SNMPVALUE} - ifHCInPkts
Type: Calculated
Key: ifHCInPkts.[{#SNMPINDEX}]

and I’ve tried these four exact formulas:

Formula:

last(”ifHCInBroadcastPkts.[{#SNMPVALUE}]”)+last(”ifHCInMulticastPkts.[{#SNMPVALUE}]”)+last(”ifHCInUcastPkts.[{#SNMPVALUE}]”)

last(”ifHCInBroadcastPkts[{#SNMPVALUE}]”)+last(”ifHCInMulticastPkts[{#SNMPVALUE}]”)+last(”ifHCInUcastPkts[{#SNMPVALUE}]”)

last(”ifHCInBroadcastPkts.[{#SNMPINDEX}]”)+last(”ifHCInMulticastPkts.[{#SNMPINDEX}]”)+last(”ifHCInUcastPkts.[{#SNMPINDEX}]”)

last(”ifHCInBroadcastPkts[{#SNMPINDEX}]”)+last(”ifHCInMulticastPkts[{#SNMPINDEX}]”)+last(”ifHCInUcastPkts[{#SNMPINDEX}]”)

But the only thing I see is this error:

Cannot evaluate function "last()": item ”router01:”ifHCInBroadcastPkts[{#SNMPINDEX}]”" does not exist

What am I doing wrong?

[batchenr]

Hi,

I’m trying to create a calculated item from values in interface discovery, but I haven’t really figured out how yet. I think the documentation is pretty clear, but somehow it isn’t working in my system. I’m running Zabbix 2.4.8.

So, I need to see incoming packets per second (pps) on all interfaces on a router. I have collected three values from my interface discovery rules: ifHCInBroadcastPkts, ifHCInMulticastPkts and ifHCInUcastPkts. These are working fine and I get data from each one. In order to get pps, I need to combine these into a new item.

So I created an Item Prototype in my discovery rules like this:

Name: {#SNMPVALUE} - ifHCInPkts
Type: Calculated
Key: ifHCInPkts.[{#SNMPINDEX}]

and I’ve tried these four exact formulas:

Formula:

last(”ifHCInBroadcastPkts.[{#SNMPVALUE}]”)+last(”ifHCInMulticastPkts.[{#SNMPVALUE}]”)+last(”ifHCInUcastPkts.[{#SNMPVALUE}]”)

last(”ifHCInBroadcastPkts[{#SNMPVALUE}]”)+last(”ifHCInMulticastPkts[{#SNMPVALUE}]”)+last(”ifHCInUcastPkts[{#SNMPVALUE}]”)

last(”ifHCInBroadcastPkts.[{#SNMPINDEX}]”)+last(”ifHCInMulticastPkts.[{#SNMPINDEX}]”)+last(”ifHCInUcastPkts.[{#SNMPINDEX}]”)

last(”ifHCInBroadcastPkts[{#SNMPINDEX}]”)+last(”ifHCInMulticastPkts[{#SNMPINDEX}]”)+last(”ifHCInUcastPkts[{#SNMPINDEX}]”)

But the only thing I see is this error:

Cannot evaluate function "last()": item ”router01:”ifHCInBroadcastPkts[{#SNMPINDEX}]”" does not exist

What am I doing wrong?

i might be worng but shouldnt it be like this : ?

(”ifHCInBroadcastPkts.[{#SNMPINDEX}].last()”) and (”ifHCInMulticastPkts.[{#SNMPINDEX}].last()”) and (”ifHCInUcastPkts.[{#SNMPINDEX}].last()”)

[Behemoth]

I tried your suggestion but now I get the following error message:

Invalid first parameter in function [last()].

[batchenr]

I tried your suggestion but now I get the following error message:

Invalid first parameter in function [last()].

see if helps :

https://www.zabbix.com/forum/showthread.php?t=22694

http://stackoverflow.com/questions/7...multiple-items

https://www.zabbix.com/forum/showthread.php?t=46718

[glebs.ivanovskis]

If you are trying to sum all discovered items into one, currently it is not possible without "manual labor" or API scripting.

[Behemoth]

OK, thanks. What does "manual labor" mean?

[robert.s]

I know this is resurrecting an old issue but I had the same issue and finally figured it out

sum(last_foreach(//ifHCInBroadcastPkts[*]))

should get what you need. I am also putting this here for my own use when I search this again as I inevitably will.