This counts DATA chunk retransmissions specifically to this one destination address within a multihomed association, the per-path version of cSctpAssocRtxChunks which is per-association overall. It's the object that climbs toward cSctpAssocRemAddressMaxPathRtx and eventually triggers that path being marked inactive, so watching this counter approach the max is an early warning that a specific path is about to fail over. A backup address whose retransmission count is climbing even though it's rarely actively used suggests that path itself has a latent quality problem that would surface badly if a real failover ever needed to rely on it.