nemetric (npm): 前端性能监控,采集以及上报。用于测量第一个dom生成的时间(FP/FCP/LCP)、用户最早可操作时间（fid|tti）和组件的生命周期性能,，网络状况以及资源大小等等。向监控后台报告实际用户测量值。
Keywords: performance-metrics|metrics|navigation-timing|navigatorInformation|first-paint|first-contentful-paint|first-input-delay|largest-contentful-paint|devtools|user-timing|web-performance|webperf|hardwareConcurrency|downlink|downlinkMax|effectiveType|rtt|react|性能|采集|监控|dns|dom|fcp|fid|fmp|monitor|navigation|networkinformation|perfmatters|performance|performance-analysis|performance-monitoring|tti|worker