How do I show and order the pages which lost views (popularity) in Google Analytics?
e.g. page A lost 350 unique visitors this month and page B lost 300, etc.
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If you would like to track just a few pages or a section (/blog/) and not all I would recommend setting up Custom Intelligent Event alert with a threshold. Below is a screenshot of what something like that would look like:
Its not 100% what you want but it should give you a better automated option.
Otherwise, you can just pull up pages in Behavior - All pages and using date ranges for this months + previous period. If you are interested in a particular page then you can filter it. This approach will also give you a +/- multiple metrics: