[Jammin]

He means DDOSing which isn't the issue either - we have actual DDOS protection.
A good description of the issue here can be found here.
I took plenty of video when I was online earlier in the evening too, and will try to clip/share as I get time to look at it.

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Looking at the 3 steam profiles, conn is the most likely culprit. Their account, which is a little bit under a year old, lists a vac ban from this past year, and it is noted they only have 13 hours of gmod total. Additonally, the player was banned from After hours gaming for the same reason yesterday.
The profle for Leah also notes possible wallhacks/aimbot in the comments from 2017, as well as an ancient VAC ban, but nothing else seems to suggest lag-hacking. Did find evidence of a backdoor lua script, likely for aimbot. I see nothing suspicous on Fanboy.

Given the information I now have, I am inclined to believe that conn (STEAM_0:0:562127809) is the sole culpret. Based on the level of lag that was experienced, I have no reason to believe that it was more than one person - as having more than one person lagging out the server would likely result in a crash/restart.

I'll see if someone with serverside access can better verify some of the traffic from last night, but as of now I think banning conn is the best way to go here.