what's the usage of kafka-logger's plugin argument meta_format?

[ryan4yin]

The plugin's document does not clearly explain the function of meta_format.

I understand that the format of the log is controlled by log_format in plugin's metadata,
so does setting meta_format to default or origin have any effect on access logs sent by kafka-logger?

[tokers]

Yes.

[ryan4yin]

suppose I set log_format by the following command:

curl http://127.0.0.1:9080/apisix/admin/plugin_metadata/kafka-logger -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "log_format": {
        "host": "$host",
        "@timestamp": "$time_iso8601",
        "client_ip": "$remote_addr"
    }
}'

what's effect will it take when I change meta_format from origin to default?

[tokers]

The priority is lower than the meta_format in plugin config.

[ryan4yin]

so you mean the function of log_format and meta_format is the same, and meta_format has higher priority than log_format?

[tokers]

Right, they are both used for the log format.