add per-link inflight

src/control_server.c

@@ -883,6 +883,8 @@ static void send_metrics(struct control_server* server, struct control_client* c
         link_info[i].shaper_timer_active = (link->shaper_timer != NULL) ? 1 : 0;
         link_info[i].keepalive_sent = (uint32_t)link->keepalive_sent_count;
         link_info[i].keepalive_recv = (uint32_t)link->keepalive_recv_count;
+        link_info[i].inflight_bytes = link->inflight_bytes;
+        link_info[i].inflight_packets = link->inflight_packets;
         link = link->next;
     }