Kafka - Added session metrics #9183
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What does this PR do?
A new metric for the number of kafka sessions has been added.
This metric helps determine large scale of kafka parameters for
max.incremental.fetch.session.cache.slotsMotivation
When using kafka with many consumers, some parameters need to optimize performance.
https://cwiki.apache.org/confluence/display/KAFKA/KIP-227%3A+Introduce+Incremental+FetchRequests+to+Increase+Partition+Scalability
Additional Notes
Review checklist (to be filled by reviewers)
changelog/andintegration/labels attached