I block the requests to google-analytics.com, newrelic.com, and statuspage.io.

I allow the requests to atlassian.com, cloudfront.net, "bytebucket.org", and bitbucket.org.

For comparison GitHub connects to github.com, githubusercontent, githubassets.com, and githubapp.com. I am blocking the githubapp.com requests, though.

And finally sourcehut doesn't make any requests outside of sr.ht