navina commented on PR #9260:
URL: https://github.com/apache/pinot/pull/9260#issuecomment-1248401279

   > Does `groupId` apply to LLC consumer? I checked the usage of 
`StreamConfig.getGroupId()` and I think we already handled the case of missing 
group id (in `PinotTableIdealStateBuilder.getGroupIdFromRealtimeDataTable()`). 
@navina In which scenario are we getting the `null` group id?
   
   I was not aware of the 
`PinotTableIdealStateBuilder.getGroupIdFromRealtimeDataTable()` usage. But when 
the kafka consumer client config doesn't contain `group.id`, the kafka consumer 
created ends up using `null` as group id. Previously, it would default to empty 
string. This is breaking monitoring tools for existing users. 


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