public AgentIdStartTimeKey newAgentStartTimeKey(SpanBo spanBo) {
        return new AgentIdStartTimeKey(spanBo.getAgentId(), spanBo.getAgentStartTime());
    }
@author emeroad
@author jaehong.kim
@author minwoo.jung
web/src/main/java/com/navercorp/pinpoint/web/service/SpanServiceImpl.java