fluentd/label/default_metric/init.yml

parameters:
  fluentd:
    agent:
      config:
        label:
          default_metric:
            filter:
              add_general_fields:
                tag: "**"
                type: record_transformer
                enable_ruby: true
                record:
                  - name: environment_label
                    value: ${_param:cluster_domain}
                  - name: Hostname
                    value: ${fluentd:dollar}{ hostname }
            match:
              drop_everything:
                tag: '**'
                type: 'null'