Kamal Chandraprakash created KAFKA-19530:
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             Summary: RemoteLogManager should record lag stats when remote 
storage is offline
                 Key: KAFKA-19530
                 URL: https://issues.apache.org/jira/browse/KAFKA-19530
             Project: Kafka
          Issue Type: Task
            Reporter: Kamal Chandraprakash


When remote storage is offline, then the segmentLag and bytesLag metrics are 
not recorded. These metrics are useful to know the pending data to upload when 
remote storage is down. 

https://sourcegraph.com/github.com/apache/kafka/-/blob/storage/src/main/java/org/apache/kafka/server/log/remote/storage/RemoteLogManager.java?L1088

Calculate the bytesLag and segmentsLag when 
`remoteStorageManagerPlugin.get().copyLogSegmentData` throws error



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