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Remote Fetch Latency Metric

A new metric will be added to measure the amount of time taken to read from the remote storage. A timer object will be used to measure the rate of events and time taken to complete the remote-fetch event. The latencies will be measured at the broker layer not for individual topics. Note that the latency numbers returned by this metric denotes the amount of time taken to fetch the data from remote storage excluding the time spent in the executor queue.

Metric name = kafka.log.remote:type=RemoteLogReaderRemoteLogManager,name=RemoteLogReaderFetchRateAndTimeMs

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