AndrewJSchofield commented on code in PR #19293:
URL: https://github.com/apache/kafka/pull/19293#discussion_r2065960167


##########
server-common/src/main/java/org/apache/kafka/server/common/MetadataVersion.java:
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@@ -112,7 +112,22 @@ public enum MetadataVersion {
     //
 
     // Enables ELR by default for new clusters (KIP-966).
-    IBP_4_1_IV0(26, "4.1", "IV0", false);
+    IBP_4_1_IV0(26, "4.1", "IV0", false),
+
+    // Enables share groups. Note, share groups are for preview only in 4.1. 
(KIP-932).
+    IBP_4_1_IV1(27, "4.1", "IV1", false),

Review Comment:
   @junrao Let's call it ignorance. In principle, I think I could use 
`IBP_4_1_IV0`. I do note that there are several MV in the past which appear 
just to add a new RPC version such as `IBP_3_7_IV4`, which seems to fall into 
the same category. We have plenty of time to get this right before 4.1 chills.



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