trace exporter: add new type file
#3298
Merged
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新增了一种trace exporter类型:file,支持将span直接输出到本地文件。
之所以不在应用侧直接上报给链路追踪后端,一是为了防止后端异常时,span丢失;二是考虑在span收集环节增加kafka,对流量削峰。