If the average fetch size (fetch-size-avg) is consistently around 1 MiB * number of partitions per fetch request, your consumer may be hitting the max.partition.fetch.bytes limit, impacting throughput due to more requests and round trip time constraints.
A reasonable fetch rate is around 1 to 5 requests per second per broker, exceeding this along with constrained fetch size can lead to reduced application throughput and increased Kafka Broker costs.
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