Problems are: * JMX attribute: `kafka.server<type=ReplicaManager,name=IsrShrinksPerSec><Count>` Is always 0 for `Count` and all other attributes. If I shutdown any broker I would expect that this would increase.
* JMX attribute: `kafka.server<type=ReplicaManager,name=IsrExpandsPerSec><Count>` Have random behavior sometimes on shutting down broker it increases and on starting it also increases. Expands works I just don't understand what are values that increments total on each broker. This behaviours are consistent through Kafka versions: 0.10.0 - 1.0.0 I'm using Confluent Kafka distribution with versions between: 3.1, 3.2, 3.3 & 4.0 My question is this bug or something that I don't understand about Kafka? -- Stanislav Antic
