td-agent.conf

<source>
  type tail
  format json
  path /var/lib/docker/containers/*/*-json.log
  pos_file /var/lib/docker/containers/containers.log.pos
  tag docker.container.*
</source>

<match docker.container.**>
   type logentries
   host data.logentries.com
   port 80
   token %TOKEN%
</match>