issue with reading pod_name

We are trying to add pod_name to the s3 path, but the config is not able to read the pod_name from metadata. Can anyone please help. it just adding ${record["kubernetes"]["pod_name"]}

pods-fluent.conf: |-

  @type tail
  @id in_tail_container_logs
  path /var/log/containers/*.log
  pos_file /var/log/containers/fluentd/fluentd.pos
  exclude_path ["/var/log/containers/fluent*"]
  tag kubernetes.*
  path_key log_path
  read_from_head true
  <parse>
    @type kubernetes
    @type "#{ENV['FLUENT_CONTAINER_TAIL_PARSER_TYPE'] || 'json'}"
    time_format %Y-%m-%dT%H:%M:%S.%NZ
  </parse>
</source>
<filter kubernetes.**>
  @type kubernetes_metadata
  kubernetes_url "#{ENV['FLUENT_FILTER_KUBERNETES_URL'] || 'https://' + ENV.fetch('KUBERNETES_SERVICE_HOST') + ':' + ENV.fetch('KUBERNETES_SERVICE_PORT') + '/api'}"
  bearer_token_file /var/run/secrets/kubernetes.io/serviceaccount/token
  verify_ssl "#{ENV['KUBERNETES_VERIFY_SSL'] || false}"
  ca_file "#{ENV['KUBERNETES_CA_FILE']}"
  cache_size 1000
  skip_labels "#{ENV['FLUENT_KUBERNETES_METADATA_SKIP_LABELS'] || 'false'}"
  skip_container_metadata "#{ENV['FLUENT_KUBERNETES_METADATA_SKIP_CONTAINER_METADATA'] || 'false'}"
  skip_master_url "#{ENV['FLUENT_KUBERNETES_METADATA_SKIP_MASTER_URL'] || 'false'}"
  skip_namespace_metadata "#{ENV['FLUENT_KUBERNETES_METADATA_SKIP_NAMESPACE_METADATA'] || 'false'}"
  watch false
  merge_json_log false
  use_journal false
</filter>
<filter kubernetes.**>
 @type record_transformer
 enable_ruby true
 <record>
 pod ${record["kubernetes"]["pod_name"]}
 </record>
</filter>

output-fluent.conf: |- <match **> @type copy

@type stdout format json

  <store>
    @type s3
    @log_level debug
    s3_bucket "#{ENV['s3_bucket']}"
    s3_region "#{ENV['Region']}"
    path k8s-nonsensitive
    time_slice_format %Y/%m/%d/%H
    time_slice_wait 10m
    s3_object_key_format "logs/test/${record[\"kubernetes\"][\"pod_name\"]}/log_%{index}.txt"
    time_slice_format %Y/%m/%d/%H
    <instance_profile_credentials>
      ip_address 169.254.169.254
      port       80
    </instance_profile_credentials>
    <buffer tag,time>
      @type file
      flush_mode interval
      flush_interval 10s
      path /var/log/fluent/s3
      timekey 300 # 1 hour partition
      timekey_wait 1m
      timekey_use_utc true # use utc
      chunk_limit_size 100M
    </buffer>
    <format>
      @type json
    </format>
  </store> 
</match>

fluentd log : {"log":"2021-12-02 13:35:13 XXXX ::1 GET /WebApplications/ApplicationServer/ServiceListener.asmx - 443 - ::1 Mozilla/5.0+(Windows+NT;+Windows+NT+10.0;+en-US)+WindowsPowerShell/5.1.17763.1971 - 200 0 0 3626 203 9\r\r\n","stream":"stdout","log_path":"/var/log/containers/web-test-XXXXXX.log","docker":{"container_id":"XXXXXXX"},"kubernetes":{"container_name":"web-test","namespace_name":".orphaned","pod_name":"web-test-XXXXXXX","orphaned_namespace":"web-strelka-dev","namespace_id":"orphaned"},"service":"web-test-8bf54dfc6-b476z"} {"message":"out_s3: write chunk 5d229de7f9afb249d77f1325402b14d4 with metadata #<struct Fluent::Plugin::Buffer::Metadata timekey=1638452100, tag=\"fluent.info\", variables=nil, seq=0> to s3://issuing-apps-logs-devsyntheticdigitalinnov-eu-central-1-tsys/logs/test/${record[\"kubernetes\"][\"pod_name\"]}/log_5.txt"}

fabric8io / fluent-plugin-kubernetes_metadata_filter

issue with reading pod_name #316