There's this: https://reddark.untone.uk/
That's the subreddit's going dark, but not the actual traffic of the site
I don't think you can monitor traffic in real time like that. After a sustained drop in traffic you could notice it using tools like Ahrefs.
Well, reddit can. Unfortunately that is all internal data we don't have access to.
I saw https://blackout.photon-reddit.com/ with stats (% subreddits blacked out and # of posts and comments per minute) but the site seems to be struggling under load a bit.
I don't know about traffic, but this is a great live view of the subs going private: https://reddark.untone.uk
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Yeah, for that I'm watching https://www.twitch.tv/reddark_247
But I'd like to see an actual graph of the traffic of reddit, not just the subs going private.