Structured_metadata isn't inherited to match stage

Grafana Loki
1

Hi, i have the question related to promtail configuration. I’ve decided to not to use pod_name as label and add it structured metadata.
In my case I had to add it in additional to match step in pipeline because looks like it isn’t inherited from main pipeline stage. Could you please suggest more elegant way to do it if exists.

Here is my config:

config:
  clients:
    - url: http://loki-gateway/loki/api/v1/push

  snippets:
    extraRelabelConfigs:
      - source_labels: [__meta_kubernetes_pod_annotation_promtail_parser]
        action: replace
        target_label: promtail_parser
        regex: (.*)
        replacement: $1
      - source_labels: [ __meta_kubernetes_pod_name]
        action: replace
        target_label: pod_name
        regex: (.*)
        replacement: $1

    pipelineStages:
      - cri: {}
      - structured_metadata:
          pod_name:
      - match:
          selector: '{promtail_parser="java-basic-format"}'
          stages:
            - multiline:
                firstline: '^ts=[\d\s\-:\.]+ '
                max_lines: 512
            - regex:
                expression: '^(?s)ts=(?P<timestamp>[\d\s:\.\-]+)\s+th=(?P<thread>[^\s]+)\s+ln=(?P<logger_name>[^\s]+)\s+\[(?P<level>[A-Z]+)\]\s+(?P<message>.*)$'
            - timestamp:
                source: timestamp
                format: 2006-01-02 15:04:05.000
            - structured_metadata:
                thread:
                logger_name:
                level:
                pod_name:
            - output:
                source: message
            - labeldrop:
                - promtail_parser
      - labeldrop:
          - filename
          - pod_name
    common:
      - action: replace
        source_labels:
          - __meta_kubernetes_pod_node_name
        target_label: node_name
      - action: replace
        source_labels:
          - __meta_kubernetes_namespace
        target_label: namespace
      - action: replace
        replacement: $1
        separator: /
        source_labels:
          - namespace
          - app
        target_label: job
      - action: replace
        source_labels:
          - __meta_kubernetes_pod_container_name
        target_label: container
      - action: replace
        replacement: /var/log/pods/*$1/*.log
        separator: /
        source_labels:
          - __meta_kubernetes_pod_uid
          - __meta_kubernetes_pod_container_name
        target_label: __path__
      - action: replace
        replacement: /var/log/pods/*$1/*.log
        regex: true/(.*)
        separator: /
        source_labels:
          - __meta_kubernetes_pod_annotationpresent_kubernetes_io_config_hash
          - __meta_kubernetes_pod_annotation_kubernetes_io_config_hash
          - __meta_kubernetes_pod_container_name
        target_label: __path__