Hi there,

Since months ago, we noticed our Kafka producer is seeing from time to time 
request latency when trying to produce, and specific consumers (not sure if all 
of them since we have too many) seeing clearly fetch latency, which ending into 
Kafka lag, even sometimes producer and consumers are pretty aligned in latency 
peaks, and very often is clearly connected to high producing rate for certain 
topics at the same time, but even seeing when not so maybe something else 
happening.

Historically (exactly from version 2.2.1) we have enabled idempotence following 
your official recommendation to not missing data or out of order, so could be 
root cause of bottleneck under pressure and explaining those latencies?

If not, what else could explain such thing? Maybe topic throughput is going 
down for some reason? Do you have any recommendation what to verify?

Thanks


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