消息操作——统计在消息总线中发送和接收到的消息数量，未响应的请求也包含在内。
Message Operations - counts the number of messages sent to, or received from, the Service Bus, including requests that return empty.
这些出口类型常见的用法包括：计算发送或接收数据的数量，或者执行某种形式的数据转化，比如压缩。
Typical USES of these exit types might include performing accounting of the amount of data sent or received, or some form of data transformation, such as compression.
在这种情况下，获取统计数据有助于调试，比如接口发送或接收的数据包数量和发送或接收的RPC调用数量。
In such cases, getting statistics like number of packets sent or received and the number of RPC calls sent or received by that interface helps in debugging.
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