Complete 2.1.1 -> 2.2.0 changelog is available here
The linuxserver fork of the containers I maintain are now available, see the post viewtopic.php?p=239301#p239301 in this thread.
As always, I recommend libtorrent v1.2.x for torrenting (running a thin client does not matter, just the daemon part). If you are looking for containers (Docker) for this latest version, they will be available shortly. You can always check Help -> About to see which version of the client and server are running and which libtorrent is running.
Hot Tip: I recommend putting the "Tracker" column on the farthest left of the torrent view pane and sliding it down as small as possible. I made a PR that fixes all tracker icons displaying as long as the tracker URL itself has a favicon.ico. If the tracker itself's URL does not have a favicon,you'll need to go to the "real" tracker site and add /favicon.ico to save it, then you can have the tracker icon by itself on the farthest left to reference which tracker they belong to quickly!
I'm collecting tracker icons for those who find their tracker does not have them. You must go to the tracker's real site with /favicon.ico added. This must be resized to 16x16 and saved as a PNG file with zero compression. The filename must be the same as the one displayed in the Trackers list. So if it's "tracker.domain.com/announce" for the full tracker URL in 'edit trackers', your filename needs to be "domain.com.png" 16x16 and placed in your config folder (%APPDATA%/deluge/icons), and Deluge will need to be restarted.
Here is a bunch of mostly unidentified tracker icons. If you know the tracker is alive and want to help identify it, let me know which tracker it is and the row and column. The bottom left is 1x1, and the second from the left on the bottom is 1x2, so height x length. Would recommend you PM me this information, as I will need the main domain and TLD - as above, to convert It to .png with proper naming to be picked up by Deluge. If you have any questions about this, you can also PM me.
There will be quite a few trackers that don't have favicons, but we have them or can get them, so I'd like to make a pack for all of us to have complete icon sets for our trackers as seen in the picture below!

If you have any other questions, ideas/thoughts, start up a conversation!