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License: MIT License
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[bug] out of memory
<--- Last few GCs --->
[40456:0x332be20] 177616 ms: Mark-sweep 1406.9 (1659.3) -> 1406.8 (1659.3) MB, 663.0 / 0.0 ms allocation failure GC in old space requested
[40456:0x332be20] 178292 ms: Mark-sweep 1406.8 (1659.3) -> 1406.8 (1658.8) MB, 675.8 / 0.0 ms last resort GC in old space requested
[40456:0x332be20] 178949 ms: Mark-sweep 1406.8 (1658.8) -> 1406.8 (1658.8) MB, 656.3 / 0.0 ms last resort GC in old space requested
<--- JS stacktrace --->
==== JS stack trace =========================================
Security context: 0x166045fa5ee1
1: execute [/home/appops/kaola-weex-fed/kaola-weex-fed-stable_perfjd/@kapp/approot/node_modules/kagent/lib/core/parser/abstract-parser.js:~102] [pc=0x1ccf34ab194d](this=0x1fbd900cabc9 ,data=0x3db34653edd9 <Very long string[62116]>)
3: onData [/home/appops/kaola-weex-fed/kaola-weex-fed-stable_perfjd/@kapp/approot/node_modules/kagent/lib/core/parser/abstr...
MetrixParser 分析，时间单位错误，QPS 接收单位时 s，而非目前的 ms
class Timer extends Metric {
constructor() {
super();
this._time = Date.now();
}
[TimerMethods.end]() {
this.addMetric(MetrixTypes.timer, TimerMethods.update, Date.now() - this._time);
}
}[built-in] Runner 当前已经是运行状态，无法再次开启 Runner
当 metrix-parser 超出限制时 limit 时，Runner 当前已经是运行状态，无法再次开启 Runner
异常统计优化
groupby(type: message), 加入 count 字段
kagent 进程出现内存泄漏
版本：v0.1.7
现象：
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