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The TopologyDescription common struct mirrors the struct used by StreamsGroupTopologyDescriptionUpdateRequest (same field names and shape). Because Kafka RPC schemas do not share common structs across message files, the struct is duplicated in StreamsGroupDescribeResponse.json. Setting these fields does not change the ErrorCode on the DescribedGroup: a group with a successful describe but a missing or failed topology fetch still returns ErrorCode=NONE. The TopologyDescriptionStatus field tells the caller why TopologyDescription is null, so that "waiting for first push" (NOT_STORED) can be distinguished from "broker-side fetch failed" (ERROR) without an error-level change to the describe result.
DeleteGroupsResponse Change
No schema change. A new error code is added to the per-group ErrorCode slot of the existing DeleteGroupsResponse:
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