What is the difference between “out of sync replicas” and “under-replicated-partitions”?
Out of sync means the replica broker is available, but not up to date (active replication is happening)
Under replicated typically means a replica broker is not available
A useful link if you want to see these details in a more deep of a dive
https://www.confluent.io/blog/hands-free-kafka-replication-a-lesson-in-operational-simplicity/
