In this case, the action is simply to generate some form of notice, but you could perform a more complex action (such as the issuance of a citation) as the rule action.

在这个例子中，活动就是简单地生成某种形式的通知，但也可以在规则活动中执行更复杂的活动(如发传票)。

youdao

Another sportsman aboard the 57-foot charter boat Citation had hooked one a minute before, and everyone had turned their backs on Whalen to watch the action.

FORBES: The Young Man And the Sea