jagerzhang commented on issue #5910:
URL: https://github.com/apache/apisix/issues/5910#issuecomment-1002364234
> Hi @jagerzhang, AFAIK, you could follow this step to configure
kafka-logger plugin:
>
> 1. (optional) `PUT /plugin_metedata` to use your custom `log_format`
configuration for that plugin;
> 2. `PUT /routes` with `kafka-logger` configuration.
>
> plugin_metedata is more like a General configuration, and it will work for
all `kafka-logger` plugin.
感谢回复，这个方法我知道了哈，但是有另外一个疑问，因为如果按照这个方法来定义log_format，那么日志格式就完全按照定义的log_format来生成了，这里是一个覆盖模式，希望支持下增量模式，即我定义的字段只是append到默认的日志里面而不是直接覆盖。
比如 log_format 我定义为 `{"upstream_latency":
$upstream_latency}`，那么最终日志格式希望是在默认日志的基础上，**增加**这个字段。
不知道我这样描述清楚了么？
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