public void addLinkData(String outAgentId, ServiceType outServiceTypeCode, String hostname, ServiceType serviceTypeCode, long timestamp, short slot, long count) {
        Objects.requireNonNull(hostname, "hostname");

        this.linkCallDataMap.addCallData(outAgentId, outServiceTypeCode, hostname, serviceTypeCode, timestamp, slot, count);
    }
@param hostname
           host name or endpoint
@param slot
@param count
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/rawdata/LinkData.java