对于通知类，表示在报告间隔期间生成的通知批数。

For the notification class the number of notification batches generated during the reporting interval.

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对于在报告间隔期间生成的给定通知类的通知批次，表示尝试传递的通知数。

For notification batches of the given notification class generated during the reporting interval number of notification delivery attempts.

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