Trigger-based event correlation allows to correlate separate problems reported by one trigger.
While generally an OK event can close all problem events created by one trigger, there are cases when a more detailed approach is needed. For example, when monitoring log files you may want to discover certain problems in a log file and close them individually rather than all together.
This is the case with triggers that have Multiple Problem Event Generation enabled. Such triggers are normally used for log monitoring, trap processing, etc.
It is possible in Zabbix to relate problem events based on the event tags. Tags are used to extract values and create identification for problem events. Taking advantage of that, problems can also be closed individually based on matching tag.
In other words, the same trigger can create separate events identified by the event tag. Therefore problem events can be identified one-by-one and closed separately based on the identification by the event tag.
In log monitoring you may encounter lines similar to these:
The idea of event correlation is to be able to match the problem event from Line1 to the resolution from Line3 and the problem event from Line2 to the resolution from Line4, and close these problems one by one:
To do this you need to tag these related events as, for example, "Application 1" and "Application 2". That can be done by applying a regular expression to the log line to extract the tag value. Then, when events are created, they are tagged "Application 1" and "Application 2" respectively and problem can be matched to the resolution.
To configure event correlation on trigger level:
If configured successfully you will be able to see problem events tagged by application and matched to their resolution in Monitoring → Problems.
Because misconfiguration is possible, when similar event tags may be created for unrelated problems, please review the cases outlined below!