fluentd configuration

<source>
      @id container.log
      @type tail
      format json
      path /home/docker/containers/*/*-json.log
      pos_file /var/log/container.log.pos
      time_format %Y-%m-%dT%H:%M:%S.%NZ
      tag docker.*
      read_from_head true
</source>
# Using filter to add container IDs to each event
<filter docker.home.docker.containers.*.*.log>
    @type record_transformer
    <record>
        container_id ${tag_parts[4]}
    </record>
</filter>