Zabbix - How to check previous strings and trigger action

[mislav-eu]

Hi there.

Situation: I'm checking few URLs and they're returning strings - ERROR and SUCCESS. Since check needs to go rather frequently, there are sometimes false-positive alerts.
Question - how to check for string and previous values and launch trigger action only if result is "SUCCESS ERROR ERROR SUCCESS" - if values are "SUCCESS ERROR SUCCESS ERROR" - nothing happens/no trigger.

[kloczek]

https://www.zabbix.com/documentation/3.4/manual/config/triggers/expression

[mislav-eu]

Hi. So you combine sum with string check or? Can you provide some details/explanations?

[kloczek]

Sorry I've dropped incomplete URL. Here is correct one

https://www.zabbix.com/documentation/3.4/manual/config/triggers/expression#hysteresis

[Engraf]

<key>.str(ERROR)=0 and <key>.diff()=0

[mislav-eu]

Sorry I've dropped incomplete URL. Here is correct one
https://www.zabbix.com/documentation...ion#hysteresis

This will not work in my case, as I don't want to even launch that PROBLEM trigger in the first place (I explained).

<key>.str(ERROR)=0 and <key>.diff()=0

This could work, I'm going to test it, thank you!