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  1. Managed Service - Streams
  2. MGDSTRM-9020

determine a better `num.replica.fetchers` value in kafka broker

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      WHAT

      Kafka broker default the config `num.replica.fetchers` to 1, which means if the broker has many followers needed to replicate data from the leader, it'll be queuing in the only one thread. 

      WHY

      Improve the followers fetch performance 

      HOW

      Run benchmark tests to find out the best configuration for RHOSAK

      DONE

      1. Add the new `num.replica.fetchers` number as the default broker config in fleetshard
      2. Document the findings, ex: the performance gains

              Unassigned Unassigned
              lukchen@redhat.com Luke Chen
              Kafka Integrations
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