We use GitLab on the daily. Roughly 200 repos pushing to ~20 on any given day. There have been a few small, unpublished outages that we determined were server side since we have a geo-distributed team, but as a platform seems far more stable than 5-6 years ago.
My only real current complaint is that the webhooks that are supposed to fire in repo activity have been a little flaky for us over the past 6-8 months. We have a pretty robust chatops system in play, so these things are highly noticeable to our team. It’s generally consistent, but we’ve had hooks fail to post to our systems on a few different occasions which forced us to chase up threads until we determined our operator ingestion service never even received the hooks.
That aside, we’re relatively happy customers.