您必须遍历不相关事件的日志，以找到所需的内容，这在活动服务器上可能很棘手。
You have to go through logs of unrelated events to find what you need, which can be a nightmare on a live server.
它描述了允许服务管理其事件相关订阅的订阅管理器。
It describes subscription managers that allow a service to manage its subscriptions about events.
组件通过服务器端api报告更改事件，以通告相关的更改，例如某个构建版本的完成，或者到某个流的传输。
Components report change events via a server-side API to announce interesting changes, such as the completion of a build, or a delivery to a stream.
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