fluent/fluentd

<system>
  <counter_server>
    scope server1
    bind 127.0.0.1
    port 24321
    backup_path tmp/back
  </counter_server>
</system>

<source>
  @type sample
  tag "test.data"
  auto_increment_key number
</source>

<match>
  @type stdout
</match>