@Override
        public String toString() {
            return "LoadSummary(" +
                "startTimeMs=" + startTimeMs +
                ", endTimeMs=" + endTimeMs +
                ", schedulerQueueTimeMs=" + schedulerQueueTimeMs +
                ", numRecords=" + numRecords +
                ", numBytes=" + numBytes + ")";
        }
Object that is returned as part of the future from load(). Holds the partition load time and the
end time.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/runtime/CoordinatorLoader.java