FYI - We have been running GitLab internally for over a year, we have not had a single crash or unscheduled down time, not even once. The only few things we had was that prior to about 6 months ago we noticed a lot of regressions after a major upgrade, i.e. small things not working but they weren't show stoppers, I spoke with a few people at GL about it and they were fantastic, they immediately set off a program to improve testing quality and in the last 3 months we've upgraded the day each new release has come out (weekly now I think?) and haven't had any problems that we've noticed.