yangshike opened a new issue, #11525:
URL: https://github.com/apache/apisix/issues/11525
### Description
After this parameter is set, the messages sent to Kafka look like this：
[{"a":1,"b":2},{"a":3,"b":4}]
This caused a problem, some clients could not parse this format ！
Some tools first save the message buffers and submit them in batches, but do
not merge them together.
The message from kafka is as follows：
{"a":1,"b":2},{"a":3,"b":4}
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