add doc

docs/en/latest/plugins/kafka-logger.md

@@ -55,8 +55,10 @@ It might take some time to receive the log data. It will be automatically sent a
 | log_format | object | False    |   |               | Log format declared as key value pairs in JSON format. Values only support strings. [APISIX](../apisix-variable.md) or [Nginx](http://nginx.org/en/docs/varindex.html) variables can be used by prefixing the string with `$`. |
 | include_req_body       | boolean | False    | false          | [false, true]         | When set to `true` includes the request body in the log. If the request body is too big to be kept in the memory, it can't be logged due to Nginx's limitations.                                                                                                                                                                                 |
 | include_req_body_expr  | array   | False    |                |                       | Filter for when the `include_req_body` attribute is set to `true`. Request body is only logged when the expression set here evaluates to `true`. See [lua-resty-expr](https://github.com/api7/lua-resty-expr) for more.                                                                                                                          |
+| max_req_body_bytes     | integer | False    | 524288         | >=1                   | Request bodies within this size will be pushed to kafka, if the size exceeds the configured value it will be truncated before pushing to Kafka.                                                                                                                                                                                                  |
 | include_resp_body      | boolean | False    | false          | [false, true]         | When set to `true` includes the response body in the log.                                                                                                                                                                                                                                                                                        |
 | include_resp_body_expr | array   | False    |                |                       | Filter for when the `include_resp_body` attribute is set to `true`. Response body is only logged when the expression set here evaluates to `true`. See [lua-resty-expr](https://github.com/api7/lua-resty-expr) for more.                                                                                                                        |
+| max_resp_body_bytes    | integer | False    | 524288         | >=1                   | Request bodies within this size will be pushed to kafka, if the size exceeds the configured value it will be truncated before pushing to Kafka.                                                                                                                                                                                                  |
 | cluster_name           | integer | False    | 1              | [0,...]               | Name of the cluster. Used when there are two or more Kafka clusters. Only works if the `producer_type` attribute is set to `async`.                                                                                                                                                                                                              |
 | producer_batch_num     | integer | optional    | 200            | [1,...]               | `batch_num` parameter in [lua-resty-kafka](https://github.com/doujiang24/lua-resty-kafka). The merge message and batch is send to the server. Unit is message count.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
 | producer_batch_size    | integer | optional    | 1048576        | [0,...]               | `batch_size` parameter in [lua-resty-kafka](https://github.com/doujiang24/lua-resty-kafka) in bytes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |