Impact of replica not in clusterMetadata.brokers?

Thanks to confluent_kafka.admin.AdminClient , I was inspecting the configuration of replicas in my cluster

I see that some replicas are listed in partitions but not part of the “brokers”.

  • 1024 partitions. All partitions have exactly 3 replicas.
  • we have 79 brokers total (that’s len(meta.brokers))
  • We have different 80 replicas total (set(x for partition in meta.topics['topic_name'].partitions.values() for x in partition.replicas))
  • meta = ClusterMetadata

What does having 80 replicas but 79 listed in brokers mean? Are the replicas still replicating their leader? What’s the impact on the partitions with that 80th replica?