private void bindAgentName(List<SpanBo> list, Map<AgentIdStartTimeKey, Optional<String>> agentNameMap) {
        for (SpanBo spanBo : list) {
            AgentIdStartTimeKey key = new AgentIdStartTimeKey(spanBo.getAgentId(), spanBo.getAgentStartTime());
            Optional<String> agentName = agentNameMap.get(key);
            spanBo.setAgentName(agentName.orElse(StringUtils.EMPTY));
        }
    }
@author emeroad
@author jaehong.kim
@author minwoo.jung
web/src/main/java/com/navercorp/pinpoint/web/service/SpanServiceImpl.java