fluent/fluentd · error · Fluent::ConfigError

Section <label #{name}> appears twice

Error message

Section <label #{name}> appears twice

What it means

Error "Section <label #{name}> appears twice" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/static_config_analysis.rb:146

      end

      if l > r
        raise Fluent::ConfigError, "greater first_worker_id<#{l}> than last_worker_id<#{r}> specified by <worker> directive is not allowed. Available multi worker assign syntax is <smaller_worker_id>-<greater_worker_id>"
      end

      [l, r]
    end

    def static_label_analyse(conf)
      ret = []
      conf.elements(name: 'label').each do |e|
        name = e.arg
        if name.empty?
          raise ConfigError, 'Missing symbol argument on <label> directive'
        end

        if @labels[name]
          raise ConfigError, "Section <label #{name}> appears twice"
        end

        l = Elem::Label.new(name, e, static_filter_and_output_analyse(e))
        ret << l
        @labels[name] = l
      end

      ret
    end

    def static_filter_and_output_analyse(conf)
      ret = []
      conf.elements('filter', 'match').each do |e|
        type = e['@type']
        if type.nil? || type.empty?
          raise Fluent::ConfigError, "Missing '@type' parameter on <#{e.name}> directive"
        end

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/static_config_analysis.rb:146 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of fluent/fluentd@dd45c6e18d (2026-08-21). Data as JSON: /api/errors/31dbbfadf66a6e1b. Report an issue: GitHub.