How to create triggers with swap pused unsupported

[jonybat]

Hi

Currently running v4.4.10, and stumbled upon some issue related to triggers using the swap pused item.

We have a trigger like this:

{OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}>={$MEMORY_HIGH} and {OS Linux server - P:system.swap.size[,pused].min({$T_SYSTEM_SHORT})}>={$SWAP_MEDIUM}

It works fine for servers that have swap, however, for servers that do not have swap, it fails the calculation, because the "system.swap.size[,pused]" item becomes unsupported, with the info: Cannot be calculated because swap file size is 0.

I tried getting around it by defining a preprocessing step to that item, to match against the regex [0-9]+, with custom on fail to set value to 100. However, it does not work.

I would like to know if there is a solution for this other than having different templates for servers that do not have swap.

Cheers

[dimir]

Looks like you hit https://support.zabbix.com/browse/ZBXNEXT-6784

You are welcome to follow it. The fix is planned for 5.0 and 5.4 though as 4.4 is not supported anymore.

[jonybat]

Okay, thanks

[jonybat]

In case someone stumbles upon this, after updating to 5.0, our triggers had to be updated, since "system.swap.size[,pused]" returns 0 for systems without swap.

Maybe there is an easier way to do this, but here they are:

High - High memory usage

Problem: ({OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}>={$MEMORY_HIGH} and {OS Linux server - P:system.swap.size[,pused].min({$T_SYSTEM_SHORT})}>={$SWAP_HIGH}) or ({OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}>={$MEMORY_HIGH} and {OS Linux server - P:system.swap.size[,total].last()}=0)

Recovery: ({OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}<{$MEMORY_HIGH_TH} and {OS Linux server - P:system.swap.size[,total].last()}=0) or ({OS Linux server - P:system.swap.size[,pused].min({$T_SYSTEM_SHORT})}<{$SWAP_HIGH_TH} and {OS Linux server - P:system.swap.size[,total].last()}>0)


Medium - High memory usage
Depends on: OS Linux server - P: High memory usage (the trigger above with higher severity)

Problem: ({OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}>={$MEMORY_HIGH} and {OS Linux server - P:system.swap.size[,pused].min({$T_SYSTEM_SHORT})}>={$SWAP_MEDIUM}) or ({OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}>={$MEMORY_MEDIUM} and {OS Linux server - P:system.swap.size[,total].last()}=0)

Recovery: ({OS Linux server - P:vm.memory.size.used.min({$T_SYSTEM_SHORT})}<{$MEMORY_MEDIUM_TH} and {OS Linux server - P:system.swap.size[,total].last()}=0) or ({OS Linux server - P:system.swap.size[,pused].min({$T_SYSTEM_SHORT})}<{$SWAP_MEDIUM_TH} and {OS Linux server - P:system.swap.size[,total].last()}>0)

Cheers