Data Dog helps you manage servers and applications. Using a dashboard, you can quickly see any issues and you can use its collaborative features to quickly bring that issue to a resolution. Everything is cloud hosted so you can access it from anywhere.
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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.
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.