How can a problem have a negative duration? Would it be a version bug?

[cesarsj]

Item name: Device name
Item Type: SNMPv1 agent
Item key: sysName
Item interval: 60
Trigger: {server:sysName.nodata(1m)}=1

Problem started: 08/15/2019 02:30:39 AM
Problem solved: 08/15/2019 02:30:25 AM

Zabbix Server version: 4.0.7

[vso]

Negative problem duration is documented here:

https://www.zabbix.com/documentation/3.4/manual/web_interface/frontend_sections/monitoring/problems

[cesarsj]

Negative problem duration is documented here:
https://www.zabbix.com/documentation...oring/problems

Thanks for atention and reply

[vso]

Thanks for atention and reply

You are welcome

[borbul]

Hello!
It happens as far as I understand because in the last() function, the last received data is used, and not the last received in time.
I wanted the triggers to fire only on the data that arrived last in time. It is possible to implement it?
Function last() in Calculate items and last() in Trigger expression work differently. Trigger last() uses the last received data and last() in the Item's formula uses the last received data in time.
Why the work of functions is different?

[borbul]

FR: https://support.zabbix.com/browse/ZBXNEXT-6573
If anyone needs such functionality - vote!