When writing more complex trigger expression it is sometimes though to identify the subtlety needed in the expression.  For example if you're monitoring for slower response times. 

It would be great if we could write our expression, and then ask Zabbix to "simulate" the newly written expression/trigger on the historical data that we have in the database. 

This way we could assess if that expression would correctly match what we want to match, and does not match what it should not match.