fluentd/label/default_output/file.yml

parameters:
  _param:
    fluentd_default_output_file: /var/log/td-agent/default-all.log
  fluentd:
    agent:
      config:
        dollar: '$'
        label:
          default_output:
            filter:
              add_general_fields:
                tag: "**"
                type: record_transformer
                enable_ruby: true
                record:
                  - name: Type
                    value: log
                  - name: environment_label
                    value: ${_param:cluster_domain}
                  - name: Hostname
                    value: ${fluentd:config:dollar}{ hostname }
                  - name: Timestamp
                    value: ${fluentd:config:dollar}{ time.strftime('%Y-%m-%dT%H:%M:%S%z') }
            match:
              everything:
                tag: '**'
                type: 'file'
                path: ${_param:fluentd_default_output_file}