When comparing Uptime Robot vs Data Dog, the Slant community recommends Uptime Robot for most people. In the question“What are the best server performance monitoring tools?” Uptime Robot is ranked 5th while Data Dog is ranked 11th.
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Pros
Pro Free
Pro API
With the api ( https://uptimerobot.com/api ) it is possible to automate setup of new monitors, and edit existing monitors, as well as a slew of other functionality, using simple queries and outputs in either XML or JSON (depending on your preference).
Pro Integration with pushover
Get push alerts on your phone when your website goes down
Pro Limited free tier
5 VMs with 24h history and no alerts for free.
Pro Docker support
The Datadog Agent container runs with the other containers on a host. It collects metrics from neighboring containers and from the host. It can monitor 10 or 20 containers free per host license.
Cons
Con $15/host/month is quite expensive
If you are running big fat systems which are probably bare metal, DataDog may be a very good fit. But if you are running small virtual machines you may discover that its somewhat expensive price can become a real problem.