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replica.lag.max.messages - This config is deleted since this proposal no longer measures replica lag in terms of number of messages

replica.lag.time.max.ms - This The definition of this config now means 2 thingschanges. If a follower hasn't sent any fetch requests for this window of time, the leader will remove the follower from ISR (in-sync replicas) and treat it as dead. In addition, if a replica is has not read from the log end offset for this time, it is deemed to not be in ISR because it is not caught up.

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There is a subtle case where data is read from the log end offset and an append occurs immediately afterwards but before the lag calculation is complete. To make this more robust, the LogReadResult should return the LogOffsetMetadata corresponding to the LEO just before the read started.

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