Host availability trigger

[MichaelF]

Hello,
I created a trigger as hostname:agent.ping.last()}=0 and was expacting to see the trigger firing once the server is down but it shows its value as OK, even when the agent.ping item does show that the host is down (please see the attachments). Would you please tell me what am I doing wrong?

Thank you in advance,
Michael

[brunohl]

Hello,

Looking at your sceens, it seems to me that you are not receiving values at all for this item. If so, you should be using the trigger chained with the nodata() function.
Take a look at "Last 500 values" on "View as" on your last screen and show us if you are receiving value 0 or if you are not receiving values.

[MichaelF]

Hello brunohl,
Yes, you're right - I receive either 1 or nothing, but the Host availability item "explains' a value of 0 as "not available" - shouldn't it mean the same as "no data"? If no what's the purpose of this item...???
Would you please post an example of ~agent.ping:nodata() expression - i can't seem to find the correct example in the documantation?

[steve.destivelle]

Hi Michael,
the "no data" function is to fired the associate trigger if the item receive no value for a period of time.
That's why on Zabbix Agent active item, it is better to have on the master item (the one that other depends on like ping) the "nodata" function in parallel.

So your trigger will be like that:
{host:agent.ping:last()}=0 or {host:agent.ping:nodata(5m)}=1

Your trigger will fired with no value receive and if no data is receive since 5 minutes.
Consider to add the icmp.ping with agent.ping in order to have the best of icmp ping and agent ping.

Regards,

Steve

[MichaelF]

Thank you very much for your response, Steve!
The example you provided - {host:agent.ping:last()}=0 - is exactly the same as mine (hostname:agent.ping.last()}=0) - but I used Zabbix Agent item type - not Zabbix agent Active - can this lead to the problem?