在系统启动并运行后，您需要使用本文中介绍的一些技巧来监视该系统的运行状态并记录其输出结果。

Once the system is back up and running, you need to use some of the techniques in this article to monitor the running state of the system and record the output.

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运行时冗长控制：log4j记录程序和附加程序的冗长等级可以在系统启动时配置，并随后在运行时修改。

Runtime verbosity control: the verbosity level of log4j loggers and appenders can be configured at start time and then modified at run time.

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