Examples of KIP-714

[tsuz]

KIP-714 allows adding client side observability without monitoring the clients. Having an example and an architecture of this can be useful (if it should belong in this repository or not)

https://cwiki.apache.org/confluence/display/KAFKA/KIP-714%3A+Client+metrics+and+observability

[hifly81]

@tsuz IMHO they are relevant, it looks like we should rename this repo :)