Greetings!
It would be great if there was a trigger function that would detect an item's unsupported status.
Example:

last(unsupported(/hostname/item))=1 

The "items_unsupported" item key only tracks the number of such items, and internal events are configured separately from trigger events. However, it would be great to be able to detect the unsupported status of a specific important item through trigger events. For example, we're not interested in a one-time unsupported status, so we could do this: 

min(unsupported(/hostname/item),5m)=1