Hello, Anton!

Thank you for your issue!

Please, attach to issue (screenshots): 

1. Correlation parameters and operations (with TAG Name and Value)
2. Trigger parameters (Expression, tag names and values)

Best regards, Igor.

Hello, Igor!

Sure, here it is:

1) Event correlation rule

2) Trigger

Hello, Anton!
Can you explain the purpose and the logic of global correlation for better understanding?
Can you describe the correlation scenario, what result is expected?
Also, attach to issue detailed info from correlation rule settings and operations and some screenshots from "Monitoring-Problems" where we can see events with Tags and values from triggers (please, attach one "Event details" screenshot).

Best regards, Igor

Hello, Igor!

At this case we use global correlation for reduce the number of similar alerts / alerts with one root cause.

We also monitor EIGRP sessions between our head office and regional offices, which are created as prototypes on another hosts (head and regional routers). And we don't want to see these alerts if the regional device, for example, isn't available at all. So we decided to use tags and global correlation because we can't use classic dependencies at this case (I mean we can't create dependency for trigger already created from a prototype). And this approach generally works, apart from the above problem because of which we risk missing a problem. So we had to disable this rule.

Hello, Anton!

Please, attach the screenshots of problem details for problems which were closed by global correlation rule

Regards, Igor!

Hello, Igor

+

Anton, I think you have mutually exclusive parameters in your correlation rule

From one side - you compare the values of  old event tag with new event tag  (Region )and result must be true (equals)

From the other side you compart the same tags values with {$REGION_PREFIX} usermacro as a value

Then we have the rule

MGP=MGP

and MGP!=MGP

So, this is not Zabbix issue, just incorrect settings in global correlation rule, so I resolve the issue

More help:

Zabbix International Community in Telegram
or
Zabbix Forum

Regards, Igor

P.S. Please, try to exclude from your correlation rules steps "B" and "E":