ReadonlygroupThe group ID.
ReadonlyinstanceThe instance ID for static membership, or null.
ReadonlymemberThe member epoch. 0 to join the group. -1 to leave the group. -2 to signal a completely new member that wants to join.
ReadonlymemberThe member ID (empty string on first heartbeat).
ReadonlyrackThe rack ID, or null.
ReadonlyrebalanceThe maximum time in ms for the group to rebalance.
ReadonlyserverThe server-side assignor name, or null.
ReadonlysubscribedThe list of subscribed topic names, or null (unchanged).
Optional ReadonlytaggedTagged fields.
ReadonlytopicThe consumer's current topic-partition assignment, or null (unchanged).
ConsumerGroupHeartbeat request payload (v0).