Any reliable kafka config tuning quidelines

Hi Kafka experts,

I have a large-scale distributed system that takes around 200K connections to single broker on various topic partitions. I sometimes see my SSL port becomes unresponsive to client with high metadata latency when I sudden spike of around 30K connections (when a broker restarts or it become leader when any other high traffic broker goes for a repair). Is there a reliable way to tune the config to suit the load?

Regards,
Nanda