Nic's right about the access logs but there's an easy workaround which we use.
The "popular Content" macro (which is definitely part of Confluence Cloud) allows you to identify the most popular pages in your spaces - or across the whole site. There are a few options, such as timeframe, number of pages to report on etc. We use it in my organisation and we find it very useful. Just create a page with the popular content macro, and restrict it so that normal wiki users can't see it.
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