security directive of output plugin is not loaded on startup

It looks that the directive defined in lib/fluent/plugin/mqtt_proxy.rb like securityis not loadable from fluentd. I suppose that this is because this directive is imported from output plugin through mixin. I confirmed that parameters are not loaded by adding unittest.

@toyokazu Does this parameter work on your environment?

2018-01-05 02:19:51 +0000 [info]: parsing config file is succeeded path="/fluentd/etc/fluent.conf"
2018-01-05 02:19:51 +0000 [info]: using configuration file: <ROOT>
  <source>
    @type forward
    @id input1
    @label @mainstream
    port 24224
  </source>
  <label @mainstream>
    <match **>
      @type mqtt
      host "localhost"
      port 8883
      <format>
        @type "json"
        add_newline false
      </format>
      <security>
        use_tls true
        <tls>
          ca_file /cert/cacert.pem
          key_file /cert/private.key
          cert_file /cert/cert.pem
        </tls>
      </security>
    </match>
  </label>
</ROOT>
2018-01-05 02:19:51 +0000 [info]: starting fluentd-0.14.25 pid=5 ruby="2.3.3"
2018-01-05 02:19:51 +0000 [info]: spawn command to main:  cmdline=["/usr/bin/ruby2.3", "-Eascii-8bit:ascii-8bit", "/usr/local/bin/fluentd", "-c", "/fluentd/etc/fluent.conf", "-p", "/fluentd/plugins", "--under-supervisor"]
2018-01-05 02:19:51 +0000 [info]: gem 'fluent-plugin-mqtt-io' version '0.3.8'
2018-01-05 02:19:51 +0000 [info]: gem 'fluentd' version '0.14.25'
2018-01-05 02:19:51 +0000 [info]: gem 'fluentd' version '0.12.42'
2018-01-05 02:19:51 +0000 [info]: adding match in @mainstream pattern="**" type="mqtt"
2018-01-05 02:19:51 +0000 [info]: adding source type="forward"
2018-01-05 02:19:51 +0000 [warn]: parameter 'use_tls' in <security>
  use_tls true
  <tls>
    ca_file /cert/cacert.pem
    key_file /cert/private.key
    cert_file /cert/cert.pem
  </tls>
</security> is not used.
2018-01-05 02:19:51 +0000 [warn]: section <tls> is not used in <security> of mqtt plugin
2018-01-05 02:19:51 +0000 [warn]: section <tls> is not used in <security> of mqtt plugin
2018-01-05 02:19:51 +0000 [warn]: section <tls> is not used in <security> of mqtt plugin

toyokazu / fluent-plugin-mqtt-io

security directive of output plugin is not loaded on startup #5