Hello Dmitry,

Please provide the detailed information about your environment and how to reproduce the issue to confirm if it is a Bug.

Please note that ZBX is a Bug Tracker, not a free support page. For free support please follow this link, or you can ask for a support from Zabbix Professionals.

Regards,
Aleksejs!

aleksejs.petrovs, could you please tell me which details do I need to provide? I have a bunch of "Host group issues" widgets on the page and sometimes (not 100% of time) I see PHP error I've mentioned:

Undefined offset: 0 [jsrpc.php:191 → CScreenHostgroupTriggers->get() → make_latest_issues() → makeEventsActions() in include/actions.inc.php:1703]

From my POV (probably wrong) I can assume what array check in some conditions returns True in cases when there is no event and you can't access 0th element of empty array which raise an error:

$alerts[$problem['eventid']][0]

I could alter that php file to write some debug info to help you debug the issue if you need that - if so, please give me a patch to apply.

Paskal Olegs, that's correct. I don't know why and in which exact conditions, but on some screens once in a while after page refresh I see that PHP error. Maybe it's related with new PROBLEM events, maybe it's related with events going to OK, maybe it's something else - I don't know and I'm afraid I don't have enough knowledge to find out. Please tell me if I could do anything useful to help you in issue investigation.

Hello Dmitry!

Do we understand correctly that in order to reproduce an issue we need to follow this algorithm?

1. Add a Screen with multiple "Host group issues" widgets.
2. Have some triggers configured for the host group.
3. Have some trigger actions tied to the host group triggers.
4. Make sure an array of events are generated for the said triggers.
5. Refresh the Screen.

Regards,
Oleg

Update:
Tried with vanilla 3.4.4 Zabbix installation, could not succeed. Both browser tab extenstive refreshes were used and built-in refresh intervals.
Host configuration export and screen configuration export attached to the issue. Action configuration:
Action 1 with condition "Host group = Group 1" and operation "echo "Group 1 action" >> /tmp/some.log"
Action 2 with condition "Host group = Group 2" and operation "echo "Group 2 action" >> /tmp/some.log"
Update2: Also tried with email notifications, no success in reproducing.

Value sending script:

#!/usr/bin/bash

for i in {1..1000}; do
rvalue=$((1 + RANDOM % 100))
rhost1=$((1 + RANDOM % 2))
rhost2=$((1 + RANDOM % 2))
ritem=$((1 + RANDOM % 3))
zabbix_sender -z 127.0.0.1 -s "Test$rhost1-$rhost2" -k item$ritem -o $rvalue
sleep 1
done

Paskal, can I ask to try the same steps?
Regardless of the results, in case an issue happens again, is it possible for you to collect the web debug report and attach it to the issue? Debug mode can be turned in user group configuration, but please pay attention it would produce a higher load on your web server.

Hi Dmitry.

Does this problem still happen?

Yes.

Hello Dmitry,

We will need to elaborate to register this a bug. Please update backend and frontend to the latest 3.4.x version which is available today. Clear the browser cache before you start using frontend.

What operating system you are using? Which web server engine serves the UI? Can you confirm the PHP files are not customized? Please confirm this is not HA situation.

Kind regards,

My colleagues can't reproduce it at the moment, please feel free to resolve this one - we'll return to this if we could reproduce it in 4.0.

Thank you, Dmitry.

Hope 4.0 suits you well.

Closing this ticket now.