DNS 隧道这类通道还有一个特点：单次查询几乎不产生可观测的业务影响，所以你很难用传统的错误率或延迟指标把它捞出来。它只能靠出网面的收敛程度来防，不能靠检测来兜。把出口收成一条、把开关从监控链路里摘出来、把演练做成例行，这三件事做完，剩下的就是时间问题。

IntroductionWhen drawing graphs in Python, it is common to use a step-by-step approach: setting axes, adjusting legends, ...

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matplotlib: plotting with Python. Contribute to matplotlib/matplotlib development by creating an account on GitHub.