Jumping on a Release Train. How We Accelerated Frontend Tasks' Path to Production

I'll tell you how we implemented the merge train system (in conjunction with GitLab CI) in Mail.ru frontend projects deployment to production; what difficulties we encountered and what you may have to face if you decide to try it; what problems the technology solves and what technical solutions we had to write ourselves (spoiler — there was a lot of code); about the results — in numbers and developer feedback.