Well would you then class if email is working but sites don't load as the downtime? If you go down the services route you have to then decide which services count. What happens if you're running a streaming server on a VPS which you've installed personally and that goes down? Does that count as downtime?
Because of everything like this, providing the server is up and running, this is classed as uptime even if one service is down. On a personal computer, providing Windows is running you would treat it as up even if programmes like Word were being troublesome.
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