The current discussion feed feature is limited, mostly because it can only display at maximum 6 posts. I want to have more control of how the feed is displayed, so... should there be RSS support for Discussions?
I don't think we'll build RSS support specifically, but I know some communties have set up feeds in instances of Slack or Discord, so something like that is possible now. We will also be looking at expanding on w:c:dev:DiscussionsFeed.
Discussions activity from all wikis is logged onto an IRC channel #wikia-discussions on Freenode, so if you want to get Discussions logs for your wiki logged somewhere you can set up an IRC bot that parses messages from there (I made a bot that does that already but I mostly use it for something other than Discussions logs). The IRC channel is not too reliable, though, because sometimes the bot logging the activity may crash, and some communities I know are running Discussions activity loggers have logging bots listening to some other source of Discussions activity that may not be available to normal users. You can also try polling the Discussions API if you figure out how it works through the Network tab in your browser's developer console.