wu-sheng commented on a change in pull request #5409:
URL: https://github.com/apache/skywalking/pull/5409#discussion_r479609383
##########
File path: docs/en/setup/backend/trace-sampling.md
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@@ -15,10 +15,18 @@ agent-analyzer:
default:
...
sampleRate: ${SW_TRACE_SAMPLE_RATE:1000} # The sample rate precision is
1/10000. 10000 means 100% sample in default.
+ slowDBAccessThreshold: ${SW_SLOW_DB_THRESHOLD:default:200,mongodb:100} #
The slow database access thresholds. Unit ms.
+ forceSampleErrorSegment: ${SW_FORCE_SAMPLE_ERROR_SEGMENT:true} # When
sampling mechanism active, this config can open(true) force save some error
segment. true is default.
```
-`sampleRate` is for you to set sample rate to this backend.
-The sample rate precision is 1/10000. 10000 means 100% sample in default.
+`sampleRate` is for you to set sample rate to this backend.
+The sample rate precision is 1/10000. 10000 means 100% sample in default.
+
+`slowDBAccessThreshold` is for you to set slow database access thresholds.
Review comment:
We don't sample the segment if the statement is slow, right?
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