Problem closes without recovery expression fulfilment

[dirai19]

Hi.

There is item, for example "item1"
Type: int
History store period: 90d

And there is trigger for this item.
Problem expression:
{host:item1.change()}<0
Recovery expression:
({host:item1.max(7884000)} - {host:item1.last()}) = 0

Recovery expression logic: recovery happens if last item value = max value for 3 months period

But strange behavior occurs when problem closes with recovery expression still being False

Have anyone got something similar?
Any suggestions what can it be?

[tim.mooney]

Review the section of the manual on recovery expressions, https://www.zabbix.com/documentation...iggers/trigger

In particular:

Recovery expression

Logical expression (optional) defining additional conditions that have to be met before the problem is resolved, after the original problem expression has already been evaluated as FALSE. Recovery expression is useful for trigger hysteresis. It is not possible to resolve a problem by recovery expression alone if the problem expression is still TRUE. This field is only available if 'Recovery expression' is selected for OK event generation. Supported since Zabbix 3.2.0.

Note the words I've emphasized.

[dirai19]

Thanks for answer.
I've read docs, expressions work as expected.
I've got advice to check if Zabbix value cache is fully used. And it is.
Now this is my main version why problem occured

[cyber]

IIRC, if there is not enough historic data in cache, then it should do db query each time to obtain additional needed data and you should see that as "cache misses"... More you have those cache misses, slower your trigger calculation gets...
https://www.zabbix.com/documentation...ms/value_cache