Multiplayer Console Spam (Looking For Explanation/Reporting It)

So, our server console is getting basically spammed with this:

18.12 22:01:46 [Server] INFO Using : vl@671f59bd
18.12 22:01:46 [Server] INFO Using : vl@5afd02ac
18.12 22:01:46 [Server] INFO Using : vl@59b07528
18.12 22:01:46 [Server] INFO Using : vl@36591dfa
18.12 22:01:47 [Server] INFO Using : vl@671f59bd
18.12 22:01:47 [Server] INFO Using : vl@5afd02ac
18.12 22:01:47 [Server] INFO Using : vl@59b07528
18.12 22:01:47 [Server] INFO Using : vl@671f59bd
18.12 22:01:47 [Server] INFO Using : vl@5afd02ac
18.12 22:01:47 [Server] INFO Using : vl@59b07528
18.12 22:01:48 [Server] INFO Using : vl@671f59bd
18.12 22:01:48 [Server] INFO Using : vl@66977f3d
18.12 22:01:48 [Server] INFO Using : vl@447f0eab
18.12 22:01:48 [Server] INFO Using : vl@40397b4
18.12 22:01:48 [Server] INFO Using : vl@a6f57cc
18.12 22:01:48 [Server] INFO Using : vl@488af91a

I was just wondering, and reporting, this to you and i was wondering what this actually means and if it is harmful to the server?