hello,apache kafka: I've already subscribed to Kafka® development. I am a user of kafka，the version I am using is kafka_2.12-2.1.1 now ，I want to update my kafka broker to a new version kafka_2.12-2.4.1，cause I know the new version has a lot of optimizations, such as improvement about kafka consumer rebalance. so ,I want to know how I can verify this by experiment，this is very important for me,cause I need test results to prove the necessity of the upgrade.
ps: you can also send me the result of the test from kafka inside if there is a such result and this result is allowed to be published Looking forward to your reply as soon as possible！！！
