Your question is Owning a Hard Production Failure. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you owned a difficult production issue in a Linux-based environment where the root cause was initially unclear. Walk me through how you drove the diagnosis, how you communicated with others while you were still learning, and what you changed afterward to prevent a repeat.