The parser plugin failed to parse the message

[dgzpg]

I use the same FluentD configuration, and the output content format is the same, but some of the final parsing results are successful, and some are not. The following is the configuration of my FluentD , I want to parse the json format string I output into a json, and the non-json format will remain as it is.

    <filter **>
        @type parser
        key_name log
        reserve_time true
        reserve_data true
        emit_invalid_record_to_error false
        hash_value_field log
        <parse>
          @type multi_format
          <pattern>
            format json
          </pattern>
          <pattern>
            format none
          </pattern>
        </parse>
      </filter>

The final output is as shown in the picture:

The content format I output is a map in json format, but from the results, the value of the first log information log is a string, while the second and third are a json, so it seems that the first log Information Failed to parse json through FluentD's parser plugin.

Hope someone can help me with this problem, thanks a lot.

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