DataDog agent as privileged Pod with Service - collects info on host, and all docker containers. Accepts statsd on port 8125 on every machine.

ddagent.json

{
  "id": "ddagent",
  "kind": "ReplicationController",
  "apiVersion": "v1beta1",
  "desiredState": {
    "replicas": 3,
    "replicaSelector": {"name": "ddagent"},
    "podTemplate": {
      "desiredState": {
         "manifest": {
           "version": "v1beta1",
           "id": "xorpod",
           "containers": [{
             "name": "dogstatsd",
             "image": "datadog/docker-dd-agent",
             "ports": [{"containerPort": 8125, "protocol":"UDP",
	     		"hostPort":8125}],
	     "env":[{"name":"API_KEY",
	     	"value":"260a27722febb342b1439879b5a5240d"}],
	     "privileged":true,
	     "volumeMounts":[{"name":"dockersock",
	     "mountPath":"/var/run/docker.sock"},
	     {"name":"procmounts",
	     "mountPath":"/host/proc/mounts",
	     "readOnly":true},
	     {"name":"cgroups",
	     "mountPath":"/host/sys/fs/cgroup",
	     "readOnly":true}]
	   }],
	   "volumes":[{"name":"dockersock",
	   "hostDir":"/var/run/docker.sock"},
	   {"name":"procmounts",
	   "hostDir":"/proc/mounts"},
	   {"name":"cgroups",
	   "hostDir":"/sys/fs/cgroup/"}]
         }
       },
       "labels": {"name": "ddagent"}
      }},
  "labels": {"name": "ddagent"}
}

You can send metrics from any other docker container on the host to $SERVICE_HOST:8125