An event duration is 0. What does it mean?

[diggerzz]

Hi all.
What does a zero value in an event duration column mean?
In what circumstances does it appear?

[Atsushi]

I think that status of trigger will has changed in a very short time.

ex.
Changed status OK to PROBLEM at 09/02/2015 09:10:03 AM
Changed status PROBLEM to OK at 09/02/2015 09:10:03 AM

Trigger of the state has changed in less than one second.
This is probably why the dulation becomes 0 second.

I've confirmed with Zabbix 2.4.6, it seems 0 second is displayed 0.

[diggerzz]

I think that status of trigger will has changed in a very short time.

Atsushi
I've thought so, too.
But why had the trigger been changed at the same second instead of having been changing in next item's update interval (60 second in that case)?

I.e.
Changed status OK to PROBLEM at 09/02/2015 09:10:03 AM
Changed status PROBLEM to OK at 09/02/2015 09:10:03 AM
instead of
Changed status OK to PROBLEM at 09/02/2015 09:10:03 AM
Changed status PROBLEM to OK at 09/02/2015 09:11:03 AM

[Atsushi]

I think that it depends on the type of item.

For example, it is a log monitoring.
If a short period of time a large number of log output,
the value of the item is acquired in a short period of time.

Then, there is a possibility that the state will change
in a short time interval than the interval of the item.

[diggerzz]

I think that it depends on the type of item.

For example, it is a log monitoring.
If a short period of time a large number of log output,
the value of the item is acquired in a short period of time.

Then, there is a possibility that the state will change
in a short time interval than the interval of the item.

I.e., if an item's value changes again when a trigger is being processed, we'll see time value less than the item's update interval.
Is it right?