How did this situation even arise? I'm not suggesting this is your fault, but why didn't you ask for the process before your boss left if you weren't clear? I

How did this situation even arise? I'm not suggesting this is your fault, but why didn't you ask for the process before your boss left if you weren't clear? If I were to guess, I suspect this update is either not as important as you think it is - hence the lack of process or guidance from your boss. If it really is as important as you think then this isn't your fault. Your boss has responsibility to ensure there are processes in place to ensure this kind of stuff doesn't happen... If a junior dev is working under me and they merge some crappy code that blows up then that's my fault for not reviewing the code and it's also my problem to fix. All you can do is your best. Send an email to your boss to confirm if you understand the process. If you don't hear back from him then ask around and see if anyone else can help you. Like I say, you can only do your best. If that's not good enough then that's not your problem.