This object is the number of control chunks received on this specific association. On a per-peer basis, this separates protocol overhead, such as heartbeats and SACKs, from actual payload for that one relationship, letting an admin tell whether an unusually high total chunk count for a peer is real signaling load or just heartbeat chatter. An association where control chunks make up the vast majority of its total received chunks is mostly just keepalive traffic rather than carrying meaningful signaling volume.