hpnicfmplsInterfaceOutLabelsUsed 1.3.6.1.4.1.11.2.14.11.15.8.12.1.1.2.1.3

This object counts the number of top-most labels in the outgoing label stacks that are in use at this point in time on this interface. This object MUST count on a per-interface basis regardless of which label space the interface participates in.