[Question] kafka monitoring is not working.

### Question

I tried to add kafka monitoring, filled host and port (9092).
And when I click test button, I got `测试连接失败
Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: java.io.EOFException]`.

I have also tested port connectivity via `nc -nz 9092`.

I did not find how can I specify the username/password either.

Start at the Kafka monitoring configuration's Test button and reproduce the reported RMI/JRMP connection failure with the provided host and port. Determine how Kafka authentication is configured, including username and password handling, then make the test connection behavior or its documentation match the supported setup.

Written by the indexing model from the issue text.