Mathematical operators in JSONpath preprocessing

[troffasky]

I have three items that work as JSONpath preprocess:

$.tcp_statistics.connections_opened
$.udp_statistics.connections_opened
$.icmp_statistics.connections_opened

https://www.zabbix.com/documentation..._functionality says we have some numerical operators.

So I tried this:

$.icmp_statistics.connections_opened + $.tcp_statistics.connections_opened + $.udp_statistics.connections_opened

but:

1. Failed: cannot extract value from json by path "$.icmp_statistics.connections_opened + $.tcp_statistics.connections_opened + $.udp_statistics.connections_opened": unsupported construct in jsonpath starting with: " + $.tcp_statistics.connections_opened + $.udp_statistics.connections_opened"

It's not clear from the examples if what I am trying to do is supported. The only example with a mathematical operator in returns a string!

[Markku]

I think they can only be used in filter expressions.

If you have three items and you want sum of those, you can create a calculated item and sum them there.

Markku

[troffasky]

Yet another Zabbix feature that is about 90% of the way to being useful for me I was trying to avoid having 4 items.

[Markku]

If those three pieces of data are from a single master item and you don't need them separately, you can use javascript preprocessing step to parse and sum them, to return and save just the single value.

Markku