gen := Generation{
	ID:              generationID,
	GroupID:         cg.config.ID,
	MemberID:        memberID,
	Assignments:     cg.makeAssignments(assignments, offsets),
	conn:            conn,
	done:            make(chan struct{}),
	retentionMillis: int64(cg.config.RetentionTime / time.Millisecond),
	log:             cg.withLogger,
	logError:        cg.withErrorLogger,
}

request := offsetCommitRequestV2{
	GroupID:       g.GroupID,
	GenerationID:  g.ID,
	MemberID:      g.MemberID,
	RetentionTime: g.retentionMillis,
	Topics:        topics,
}