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http://jewelrybox.wpblog.jp/2017/08/17/pv%e3%82%92%e8%a8%88%e6%b8%ac%e3%81%a7%e3%81%8d%e3%82%8b-impressionist-%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%a6%e3%81%bf%e3%81%9f-ruby-rails/
pvを計測できる impressionist を使ってみた ruby on rails