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The ad module tracks how often each ad is viewed and clicked. The statistics are tracked to an hourly granularity.
When an advertisement is first enabled, the statistics for 'This hour', 'Today', 'Last seven days', 'This month', 'This year' and 'All time' will all be the same. When available, statistics will also include 'Last hour', 'Yesterday', 'Last month', and 'Last year'.