类：TracingChannel

【Class: TracingChannel】

类 TracingChannel 是 TracingChannel 通道 的集合，这些集合一起表达一个可追踪的动作。它用于将生成跟踪应用流程事件的过程形式化并简化。diagnostics_channel.tracingChannel() 用于构建一个 TracingChannel。与 Channel 一样，建议在文件的顶层创建并重用单个 TracingChannel，而不是动态创建它们。

【The class TracingChannel is a collection of TracingChannel Channels which together express a single traceable action. It is used to formalize and simplify the process of producing events for tracing application flow. diagnostics_channel.tracingChannel() is used to construct a TracingChannel. As with Channel it is recommended to create and reuse a single TracingChannel at the top-level of the file rather than creating them dynamically.】