想要获取Splunk 的latency time，只需要知道_indextime 和 _time就可以了，latency = _indextime- _time
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可以直接用query在Splunk查询：
1.index=app host="****" | eval diff= _indextime - _time| search diff>60| stats count, avg(diff), min(diff), max(diff) by host
2.index=app host="****" | eval diff= _indextime - _time | eval indextime=strftime(_indextime,"%Y-%m-%d %H:%M:%S") |eval capturetime=strftime(_time,"%Y-%m-%d %H:%M:%S") | table indextime capturetime diff