<source>
  @type  dummy
  @label @test
  tag    test.copy
  auto_increment_key id
</source>

<source>
  @type dummy
  @label @test
  tag    test.rr
  auto_increment_key id
</source>

<label @test>
  <match test.copy>
    @type copy
    <store>
      @type stdout
      output_type json
    </store>
    <store>
      @type stdout
      output_type ltsv
    </store>
  </match>

  <match test.rr>
    @type roundrobin
    <store>
      @type stdout
      output_type json
    </store>
    <store>
      @type stdout
      output_type ltsv
    </store>
  </match>
</label>