I have multiple Items monitoring multiple instances of a process
unfortunately, the nuimber of instances can change, so i created a bunch of items to monitor the potential instances.
rather than having a trigger per item, I created a "complex" trigger with
{srv:item1.last(0)}#0 | {srv:item2.last(0)}#0 ...

if one of the item is not supported, the trigger is in error. The logic befind the OR operator should be improved to add something like :

problem | unknown => problem
OK | unknown => OK
unknown | unknown => unknown