Fix sampling decision precedence#1335
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st0012
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Mar 13, 2021
st0012
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- When traces_sampler is set, the sentry-trace's sampling decision should be put into sampling context to let the user make explicit decision. Currently it forces the transaction to be sampled, which is wrong.
- The value of traces_sample_rate should have a lower priority than the traces_sampler and the value of parent_sampled.
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Overall looks good.
There are a few tests I think we should add, to show that precedence is working:
"when traces_sampler is provided"context:it "prioritizes traces_sampler over traces_sample_rate", where the sampler always says yes and the rate is 0, and/or the sampler always says no and the rate is 1it "prioritizes traces_sampler over inherited decision"(similar idea)
"when traces_sampler is not set"context:it "prioritizes inherited decision over traces_sample_rate"(again, similar idea)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #1335 +/- ##
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+ Coverage 98.08% 98.70% +0.61%
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Files 208 113 -95
Lines 9176 5386 -3790
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- Hits 9000 5316 -3684
+ Misses 176 70 -106 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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@lobsterkatie I also added another commit to correct |
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1. When traces_sampler is set, the sentry-trace's sampling decision should be put into sampling context to let user make explicit decision. Currently it forces the transaction to be sampled, which is wrong. 2. The value of traces_sample_rate should have a lower priority than the traces_sampler and the value of parent_sampled.
When calling this method, a sampling_context should always be provided. And in most cases, the sampling_context should be assembled in Hub#start_transaction.
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