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Down conversions are expensive since the whole response has to be read into memory for conversion. It will be useful to monitor the rate of down conversion and the time spent on conversions.

Fetch down and produce message conversion rate rates will be a meter meters in the same group as existing topic metrics TotalFetchRequestsPerSec etc.

MBean: kafka.server:type=BrokerTopicMetrics,name=FetchMessageConversionsPerSec,topic=([-.\w]+)

MBean: kafka.server:type=BrokerTopicMetrics,name=ProduceMessageConversionsPerSecFetchDownConversionsPerSec,topic=([-.\w]+)

It will also be useful to know the time taken for down conversions. Fetch down conversion time metric will be a histogram alongside other request time metrics. This time will also be included in request logs so that clients requiring expensive down conversions can be identified. Conversion time will also be added for produce requests.

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