{tag} placeholder is not working with plugin_id directive

[Sanjay Kumar]

Hello, 

I am trying to use ${tag} as a value for the "plugin_id" directive but it's not working. 

Error is : 

2019-01-09 11:45:18 +0100 [info]: parsing config file is succeeded path="/etc/td-agent/td-agent.conf"

2019-01-09 11:45:18 +0100 [error]: config error file="/etc/td-agent/td-agent.conf" error_class=Fluent::ConfigError error="Duplicated plugin id `${tag}`. Check whole configuration and fix it."

My td-agent configuration is : 

<source>

  @type forward

  port 24224

</source>

<match test.app1>

  @type copy

  <store>

    @type prometheus

    <metric>

      name fluentd_output_status_num_records_total

      type counter

      desc The total number of outgoing records

      <labels>

        tag ${tag}

        hostname ${hostname}

      </labels>

    </metric>

  </store>

  <store>

   @type file

   @id ${tag}

   path /var/log/td-agent/

   <buffer>

    timekey 1d

    timekey_use_utc true

    timekey_wait 10m

   </buffer>

  </store>

</match>

<match test.app2>

  @type copy

  <store>

    @type prometheus

    <metric>

      name fluentd_output_status_num_records_total

      type counter

      desc The total number of outgoing records

      <labels>

        tag ${tag}

        hostname ${hostname}

      </labels>

    </metric>

  </store>

  <store>

   @type file

   @id ${tag}

   path /var/log/td-agent/

   <buffer>

    timekey 1d

    timekey_use_utc true

    timekey_wait 10m

   </buffer>

  </store>

</match>

Can you please help me to fix this ? 

[Mr. Fiber]

> Can you please help me to fix this ? 

No way. I'm not sure why you need dynamic value in plugin_id.

plugin id must be static unique value for identifying plugin in fluentd instance.

Maybe, you misunderstand something about plugin id(@id) parameter.

Masahiro

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[Sanjay Kumar]

Hello Masahiro, 

Thanks for your reply.  I don't want the dynamic value, I just wanted the @id to be assigned as tag name, since we are maintaining the unique TAG name, this value should fit right for the @id too. We just want to maintain this standard and avoid the manual work.    

Anyway, if it's not doable then I will configure this manually. 

Regards,

Sanjay.

[Mr. Fiber]

> I just wanted the @id to be assigned as tag name, since we are maintaining the unique TAG name,

> this value should fit right for the @id too

In our experiecne, no user use tag for output's @id parameter bacause tag is mainly for event source/tag routing

, not for output. Semantics are totally different.

Deployment tools or something can do it for reducing maintenance cost.

[Sanjay Kumar]

Okay, yes. I got it. Thanks for the clarification.