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This proposal would add the number of in-sync replicas, as well as the number of assigned replicas per topic-partition, as reported by the partition leader.

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• "kafka.cluster:type=Partition,name=InSyncReplicasCount,topic={topic},partition={partition}" – one gauge per topic partition leader
• "kafka.cluster:type=Partition,name=AssignedReplicasCountReplicasCount,topic={topic},partition={partition}" – one gauge per topic partition leader

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