Hi everyone!
I'm David and I'm part of the core development team in Tor. A few minutes ago I just sent this to the tor-project@ mailing list about the DDoS the network is currently under:
https://lists.torproject.org/pipermail/tor-project/2017-December/001604.html
There is not much more to say about this right now but I wanted to thanks everyone here for running a relay, this situation is not pleasant for anyone especially for relay operators for which you need to deal with this attack (and extra bonus point during the holidays for some...).
Second, everyone who provided information, took the time to dig in this problem and sent their findings on this list was a HUGE help to us so again, thank you very much for this.
We will update everyone as soon as possible on the status of the tor releases that hopefully will contain fixes that should help mitigate this DDoS.
Cheers! David