[DISCUSS] KIP-264: Add a consumer metric to record raw fetch size

[Vahid S Hashemian]

Hi all,

I started a short, and hopefully trivial, KIP to add a KafkaConsumer 
metric: 
https://cwiki.apache.org/confluence/display/KAFKA/KIP-264%3A+Add+a+consumer+metric+to+record+raw+fetch+size
Your feedback and suggestions are welcome!

Thanks.
--Vahid