Request metrics provide a mechanism to trace the flow of execution of a single request through the system, and measure the processing time at each step of that flow.
请求度量提供了一种机制，用于跟踪单个请求在通过系统时的执行流，并度量执行流中每一步骤的处理时间。
A widely adopted mechanism for dealing with failures is exception handling, encompassing both capturing and logging the error and choosing an alternative execution path in the case of failures.
一种被广泛采用的失败处理机制是异常处理，包括捕获并记录错误，以及在失败发生时选择一个备选执行路径。
Define mechanism that coordinates execution of those activities in the scope of the process.
定义在流程范围内的这些活动协调执行的机制。
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