HackerDebugging Under Fire: Keep your Head when Systems have Lost their Mind • Bryan Cantrill • GOTO 2017
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在线故障会让工程师急于猜原因。Cantrill 把诊断描述成持续向系统提问：一次好的观测应能排除一类解释，再决定下一问。
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when we have questions of our systems we can simply ask itdebugging is the act of asking questions and answering them not guessing what the answer is