The issue is related to auto-discovered PPPoE interfaces monitoring.
When interface is discovered - item is created, set as supported and respective graph is available. When this same interface is discovered (client off) during the next discovery , the item gets status "Not supported" and respecitve graph is not available.
I want the graph to be not removed when related item is in "Not supported"state.
In case client is disconnected, I'd want the the traffic graph to still exist and show 0 values.

maybe solution could be configurable option "Delete graph for not supported item"?