trigger prototype, only one alert for multiple items

[Takaya]

Hello,
On a network device, I have created a LLD with an item prototype that discovers a few number of fans. I get all my objetcs and their associated speed, but when I create a trigger prototype, I wish to check if one or multiple fans are under a certain value by using this expression:
last(/FAN_r5600/fan_r5600.fan[{#SNMPINDEX}],#3)<30000
The trigger works and creates 8 alerts if 8 fans are under 30000 rpm. I'd like to have only one alert instead of multiples.
Could you help me on that please ?
Thank you!

[cyber]

As prototypes are created one by one based on discovered items, you cannot have a prototype of a trigger, what considers more discovered items.. Discovery does not know how many items you want to consider, it may not find enough etc etc..

PS. last(/host/key,#3) refers to 3rd value from last... not "3 last values"...
Just a common mistake, people do...

[Takaya]

Thanks for the tip, I will use last #3 and last #2 and last if I want the last 3 values in default. So, as today there is no way to calculate a trigger prototype that will only create one alert whatever the number of items returned by the item prototype. A way to get around would be to create an item taking a min on all items prototype min(last_foreach//test[*)]) and create a simple trigger.
Am I right ?

[cyber]

yep, calculated item it is...