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correct the doc of backend trace sampling with the latest configuration (#6085)

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Viktor Yi 2020-12-26 19:10:42 +08:00 committed by GitHub
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@ -59,6 +59,7 @@ Release Notes.
* Update the documents of backend fetcher and self observability about the latest configurations.
* Add documents about the group name of service.
* Update docs about the latest UI.
* Update the document of backend trace sampling with the latest configuration.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/68?closed=1)

2
docs/en/setup/backend/trace-sampling.md
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@ -14,7 +14,7 @@ In **agent-analyzer** module, you will find `sampleRate` setting.
agent-analyzer:
default:
...
sampleRate: ${SW_TRACE_SAMPLE_RATE:1000} # The sample rate precision is 1/10000. 10000 means 100% sample in default.
sampleRate: ${SW_TRACE_SAMPLE_RATE:10000} # The sample rate precision is 1/10000. 10000 means 100% sample in default.
forceSampleErrorSegment: ${SW_FORCE_SAMPLE_ERROR_SEGMENT:true} # When sampling mechanism activated, this config would make the error status segment sampled, ignoring the sampling rate.
slowTraceSegmentThreshold: ${SW_SLOW_TRACE_SEGMENT_THRESHOLD:-1} # Setting this threshold about the latency would make the slow trace segments sampled if they cost more time, even the sampling mechanism activated. The default value is `-1`, which means would not sample slow traces. Unit, millisecond.
```