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You can suggest new features at https://digitalocean.uservoice.com/. In the mean time, you could use Pingdom or one of the other thousands of monitoring services out there.
For my servers, I use icinga. I can configure to tests my server (not only the uptime but every aspect of it). And with the app anag on my android phone, I get all the stats of my servers. When I get an alert, icinga send me an email, and the app anag start buzzing until I shut it off or I fix the problem.