https://blog.wongcw.com/2019/07/10/gartner%e5%a0%b1%e5%91%8a%ef%bc%9aaws%e5%b8%82%e5%a0%b4%e4%bb%bd%e9%a1%8d%e4%b8%8b%e8%b7%8c4-%e9%98%bf%e9%87%8c%e9%9b%b2%e5%a2%9e%e9%95%b7%e8%bf%91%e4%b8%80%e5%80%8d/