We are using the APC UPS by SNMP template to monitor our UPS device.
The item we use is:
Name: Output status  
Type: SNMP agent  
Key: output.status[upsBasicOutputStatus]  
OID: 1.3.6.1.4.1.318.1.1.1.4.1.1.0  
Update interval: 1m  

The value mapping corresponds to the PowerNet-MIB, where:

• 2 = On line

• 3 = On battery

We want the trigger to activate only if the UPS remains on battery for 5 minutes continuously (to avoid false alerts during short power flickers).

We have tried the following trigger expressions:
min(/APC UPS by SNMP/output.status[upsBasicOutputStatus],5m)=3

min(/APC UPS by SNMP/output.status[upsBasicOutputStatus],{$SNMP.TIMEOUT})=3

However, in both cases, the trigger is activated after only 30–40 seconds following a power outage, instead of after 5 minutes as expected.

Our item update interval is 1 minute, so we expected Zabbix to evaluate the trigger condition only after five consecutive polls reporting the value 3.

Question / Expected behavior:
How can we correctly configure a trigger expression that will activate only if the UPS status remains 3 (on battery) for the entire 5 minutes?