Alert Checkers - not working

Thanks for response!

I think, that now is everythink OK. You can close a ticket. Thanks for your help.

Not know, show more info.. page screenshots for example.

I can't reproduce such trouble.

Probably there was little issue with html_callback(), fixed now.
But this does not affect the answer about the small memory for PHP.

Thanks for your help. But I found other problem in section "Alert logging". Last showed alert is 4 days ago, Why is not working alert logging ?

For this case we have FAQ doc entry:
https://docs.observium.org/faq/#im-getting-a-blank-browser-window-or-server-error-on-some-pages-especially-the-ports-page-but-not-others

Increase minimum allowed memory for PHP.
If you use an latest Observium, go to Global Settings and set "Minimum PHP memory limit" to 1024M or greater..

I found something like this: [Mon Jan 13 15:19:37.563487 2025] [php:error] [pid 2461201] [client 10.106.100.100:37714] PHP Fatal error:  html_callback(): Cannot use output buffering in output buffering display handlers in /opt/observium/html/includes/functions.inc.php on line 113, referer: https://observium.domain.sk/

What can I do ?

Hello, you should check apache errors log.

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Please make and attach additional information about the device:

• full snmp dump from device:

  snmpwalk -v2c -c <community> -t 3 -Cc --hexOutputLength=0 -Ih -ObentxU <hostname> .1 > myagent.snmpwalk

  snmpwalk -v2c -c <community> -t 3 -Cc --hexOutputLength=0 -Ih -ObentxU <hostname> .1.3.6.1.4.1 >> myagent.snmpwalk

  If device not support SNMP version 2c, replace -v2c with -v1.

• If you have problems with discovery or poller processes, please do and attach these debugs:

  ./discovery.php -d -h <device>

  ./poller.php -d -h <device>

• additionally attach device and/or vendor specific MIB files

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