类：Channel

【Class: Channel】

类 Channel 表示数据管道中的一个名为通道的个体。它用于跟踪订阅者，并在有订阅者存在时发布消息。它作为一个独立的对象存在，以避免在发布时进行通道查找，从而实现非常快速的发布速度，并在高频使用时产生极低的成本。通道通过 diagnostics_channel.channel(name) 创建，不支持直接使用 new Channel(name) 构造通道。

【The class Channel represents an individual named channel within the data pipeline. It is used to track subscribers and to publish messages when there are subscribers present. It exists as a separate object to avoid channel lookups at publish time, enabling very fast publish speeds and allowing for heavy use while incurring very minimal cost. Channels are created with diagnostics_channel.channel(name), constructing a channel directly with new Channel(name) is not supported.】