AndrewJSchofield commented on code in PR #19293:
URL: https://github.com/apache/kafka/pull/19293#discussion_r2038119258


##########
core/src/test/scala/unit/kafka/server/AbstractApiVersionsRequestTest.scala:
##########
@@ -85,6 +85,9 @@ abstract class AbstractApiVersionsRequestTest(cluster: 
ClusterInstance) {
 
       assertEquals(0, 
apiVersionsResponse.data().supportedFeatures().find(EligibleLeaderReplicasVersion.FEATURE_NAME).minVersion())
       assertEquals(EligibleLeaderReplicasVersion.ELRV_1.featureLevel(), 
apiVersionsResponse.data().supportedFeatures().find(EligibleLeaderReplicasVersion.FEATURE_NAME).maxVersion())
+
+      assertEquals(0, 
apiVersionsResponse.data().supportedFeatures().find(ShareVersion.FEATURE_NAME).minVersion())
+      assertEquals(ShareVersion.SV_1.featureLevel(), 
apiVersionsResponse.data().supportedFeatures().find(ShareVersion.FEATURE_NAME).maxVersion())

Review Comment:
   The aim here is that `unstable.feature.versions.enable=true` should not be 
required to enable share groups in AK 4.1. They should be disabled on new 
brokers by default, but possible to enable using `kafka-features.sh upgrade`. 
I'm trying to do what was done for the ELR preview 
(https://github.com/apache/kafka/pull/17867 and then 
https://github.com/apache/kafka/pull/18954).
   
   In AK 4.2, the metadata version will be `IBP_4_2_IV0`, so a new broker 
should get `share.version=1` by default.



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