<filter kubernetes.**>
  @type parse_json_field
  merge_json_log "#{ENV['MERGE_JSON_LOG'] || 'false'}"
  preserve_json_log "#{ENV['PRESERVE_JSON_LOG'] || 'true'}"
  json_fields "#{ENV['JSON_FIELDS'] || (ENV['USE_JOURNAL'] == 'true' ? 'MESSAGE,log' : 'log,MESSAGE')}"
</filter>
