File vnet/interface.h: *vnet_interface_counter_type_t* has: ... VNET_INTERFACE_COUNTER_MPLS = 8, VNET_N_SIMPLE_INTERFACE_COUNTER = 9, ...
In vnet/interface.c function vnet_interface_init im->sw_if_counters[...].name is initialized for all counters except VNET_INTERFACE_COUNTER_MPLS In vnet/interface_format.c function format_vnet_sw_interface_cntrs line 272 cm->name is not string, but 0.