The largest public instance of it that I know of is codidact.com; codidact.org is the sponsoring organization.
I think the magic number is 4: email, chat, wiki, tickets - we don't do much email so more like 3. The problem is none of those are good at longer technical discussions. With chat, threads beyond a day or so in the past are clunky to revive and follow. Wiki is better at finalized docs, tickets are short lived and any technical discussion should be settled by the time someone is working an item.
Really curious if others have found solutions.
Teams I work with use GDocs for editing group knowledge things, then export to Runbook.
"... Lemmy is similar to sites like Reddit, Lobste.rs, or Hacker News: you subscribe to forums you're interested in, post links and discussions, then vote, and comment on them. Behind the scenes, it is very different; anyone can easily run a server, and all these servers are federated (think email), and connected to the same universe, called the Fediverse."
I’m strongly considering it for our team. We use Slack threads and it’s not working for us, at all. We need more openness too.