fix(test-optimization): omit empty FTR capture containers by juan-fernandez · Pull Request #9304 · DataDog/dd-trace-js

juan-fernandez · 2026-07-13T10:16:59Z

What does this PR do?

Omits empty capture containers from Failed Test Replay DI snapshots before they are sent through the Test Optimization logs path. This keeps captured object and collection types while avoiding empty or null fields, elements, and entries payloads that can break debugger UI rendering.

The cleanup now only prunes recognized captured values and traverses all remaining object-valued children, so application variables or properties named fields, elements, or entries cannot block recursive cleanup.

This also adds coverage for the raw serialized FTR DI log body, verifying that captured empty objects, arrays, and maps preserve their type while omitting empty containers. The existing raw log assertions also confirm git ddtags are present for the covered FTR paths.

Motivation

FTR snapshots can include empty captured objects and collections. In the Test Optimization logs flow, those empty containers may surface as fields: null, elements: null, or entries: null in the debugger UI, causing capture rendering failures.

Additional Notes

Verification covers the worker snapshot cleanup matrix, recursive name-collision cases, metadata preservation, and a Jest FTR integration path that inspects the raw DI log body received by the fake intake.

dd-octo-sts · 2026-07-13T10:18:02Z

Overall package size

Self size: 6.71 MB
Deduped: 7.37 MB
No deduping: 7.37 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.3.1 | 122.62 kB | 438.86 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | dc-polyfill | 0.1.11 | 25.74 kB | 25.74 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

datadog-official · 2026-07-13T10:22:39Z

Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 96.54% (+0.01%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: d94153a | Docs | Datadog PR Page | Give us feedback!}

pr-commenter · 2026-07-13T10:30:45Z

Benchmarks

Benchmark execution time: 2026-07-13 11:30:27

Comparing candidate commit d94153a in PR branch juan-fernandez/ftr-empty-fields-snapshot with baseline commit 66bce78 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2309 metrics, 49 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

Unstable benchmarks

These benchmarks have a confidence interval too wide to call a change; treat them as noise rather than signal.

scenario:appsec-appsec-enabled-24

unstable execution_time [-205.827ms; +202.660ms] or [-7.799%; +7.679%]

scenario:appsec-appsec-enabled-26

unstable execution_time [-236.150ms; +242.085ms] or [-9.289%; +9.522%]

scenario:appsec-appsec-enabled-with-attacks-24

unstable execution_time [-164.230ms; +159.008ms] or [-5.269%; +5.101%]

scenario:appsec-appsec-enabled-with-attacks-26

unstable execution_time [-185.837ms; +193.920ms] or [-6.408%; +6.687%]

scenario:appsec-control-20

unstable execution_time [-105.238ms; +140.013ms] or [-6.387%; +8.498%]

scenario:appsec-control-24

unstable execution_time [-117.595ms; +115.338ms] or [-9.516%; +9.333%]

scenario:appsec-control-26

unstable execution_time [-123501.043µs; +124673.643µs] or [-9.996%; +10.091%]

scenario:appsec-iast-no-vulnerability-control-20

unstable execution_time [-11.966ms; +21.065ms] or [-4.656%; +8.196%]

scenario:appsec-iast-no-vulnerability-iast-enabled-always-active-20

unstable execution_time [-11.324ms; +15.996ms] or [-4.497%; +6.352%]

scenario:appsec-iast-with-vulnerability-control-20

unstable cpu_usage_percentage [-5.755%; +4.290%]
unstable execution_time [-30.886ms; +41.004ms] or [-5.589%; +7.420%]

scenario:appsec-iast-with-vulnerability-iast-enabled-always-active-20

unstable execution_time [-26.250ms; +32.360ms] or [-4.795%; +5.912%]

scenario:debugger-line-probe-with-snapshot-default-24

unstable cpu_user_time [-2.915s; +0.161s] or [-30.743%; +1.694%]
unstable execution_time [-2.959s; +0.171s] or [-29.015%; +1.680%]
unstable instructions [-24.9G instructions; +1.4G instructions] or [-32.048%; +1.748%]
unstable throughput [-77.214op/s; +785.866op/s] or [-2.344%; +23.859%]

scenario:debugger-line-probe-with-snapshot-default-26

unstable cpu_user_time [-3408.989ms; +5292.445ms] or [-31.319%; +48.623%]
unstable execution_time [-3529.879ms; +5480.238ms] or [-30.408%; +47.210%]
unstable instructions [-29.6G instructions; +46.8G instructions] or [-32.265%; +51.063%]
unstable max_rss_usage [-10.796MB; +16.705MB] or [-6.595%; +10.205%]
unstable throughput [-1067.158op/s; +715.639op/s] or [-35.897%; +24.072%]

scenario:debugger-line-probe-with-snapshot-minimal-24

unstable cpu_user_time [-1659.786ms; +2646.899ms] or [-19.947%; +31.811%]
unstable execution_time [-1647.772ms; +2667.447ms] or [-18.268%; +29.573%]
unstable instructions [-14.1G instructions; +22.8G instructions] or [-20.774%; +33.556%]
unstable max_rss_usage [-6.990MB; +11.090MB] or [-4.461%; +7.077%]
unstable throughput [-760.461op/s; +467.149op/s] or [-20.965%; +12.878%]

scenario:debugger-line-probe-with-snapshot-minimal-26

unstable cpu_user_time [-1873.728ms; +572.343ms] or [-20.002%; +6.110%]
unstable execution_time [-1889.647ms; +592.707ms] or [-18.736%; +5.877%]
unstable instructions [-16.5G instructions; +5.0G instructions] or [-21.130%; +6.443%]
unstable throughput [-133.397op/s; +424.492op/s] or [-4.096%; +13.033%]

scenario:debugger-line-probe-without-snapshot-24

unstable cpu_user_time [-2677.666ms; +2406.925ms] or [-28.978%; +26.048%]
unstable execution_time [-2684.662ms; +2423.553ms] or [-26.911%; +24.294%]
unstable instructions [-23.1G instructions; +20.8G instructions] or [-30.391%; +27.396%]
unstable max_rss_usage [-11357.942KB; +10731.542KB] or [-7.093%; +6.702%]
unstable throughput [-617.956op/s; +728.327op/s] or [-18.539%; +21.851%]

scenario:debugger-line-probe-without-snapshot-26

unstable cpu_user_time [-2074.737ms; +3289.837ms] or [-22.118%; +35.072%]
unstable execution_time [-2115.901ms; +3305.415ms] or [-20.958%; +32.741%]
unstable instructions [-18.5G instructions; +29.2G instructions] or [-23.650%; +37.314%]
unstable max_rss_usage [-6.481MB; +10.534MB] or [-4.076%; +6.625%]
unstable throughput [-717.191op/s; +464.780op/s] or [-22.061%; +14.297%]

scenario:dogstatsd-with-tags-20

unstable cpu_user_time [-266.156ms; +467.772ms] or [-5.494%; +9.655%]
unstable execution_time [-261.064ms; +465.208ms] or [-5.306%; +9.455%]
unstable throughput [-164871.739op/s; +84262.168op/s] or [-9.623%; +4.918%]

scenario:plugin-aws-sdk-lambda-inject-with-context-24

unstable cpu_user_time [-152.402ms; +231.417ms] or [-4.033%; +6.124%]
unstable execution_time [-152.983ms; +230.808ms] or [-4.024%; +6.071%]

scenario:plugin-graphql-long-with-depth-off-20

unstable max_rss_usage [-7.989MB; +5.530MB] or [-6.179%; +4.277%]

scenario:plugin-graphql-long-with-depth-on-max-20

unstable cpu_user_time [-748.292ms; +690.032ms] or [-5.797%; +5.346%]
unstable execution_time [-750.500ms; +691.180ms] or [-5.687%; +5.238%]
unstable throughput [-3.147op/s; +3.442op/s] or [-5.161%; +5.645%]

codecov · 2026-07-13T10:33:56Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.58%. Comparing base (66bce78) to head (d94153a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9304      +/-   ##
==========================================
+ Coverage   96.57%   96.58%   +0.01%     
==========================================
  Files         918      918              
  Lines      121577   121584       +7     
  Branches    21074    20994      -80     
==========================================
+ Hits       117407   117433      +26     
+ Misses       4170     4151      -19

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datadog-official

More details

PR successfully removes empty FTR capture containers while safely handling edge cases. Unit test validates recursive deletion of empty fields, elements, and entries from captured values, proper handling of property name collisions, and preservation of metadata. No behavioral regressions identified.

Was this helpful? React 👍 or 👎

_{📊 Validated against 15 scenarios · Open Bits AI session}

_{🤖 Datadog Autotest · Commit d94153a · What is Autotest? · Any feedback? Reach out in #autotest}

github-actions Bot added semver-patch test-optimization labels Jul 13, 2026

juan-fernandez force-pushed the juan-fernandez/ftr-empty-fields-snapshot branch from b7d78b3 to 153d69a Compare July 13, 2026 11:08

fix(test-optimization): omit empty FTR capture containers

d94153a

juan-fernandez force-pushed the juan-fernandez/ftr-empty-fields-snapshot branch from 153d69a to d94153a Compare July 13, 2026 11:16

juan-fernandez marked this pull request as ready for review July 13, 2026 11:30

juan-fernandez requested a review from a team as a code owner July 13, 2026 11:30

datadog-official Bot reviewed Jul 13, 2026

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gnufede approved these changes Jul 13, 2026

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juan-fernandez merged commit adf5f1c into master Jul 13, 2026
814 of 815 checks passed

juan-fernandez deleted the juan-fernandez/ftr-empty-fields-snapshot branch July 13, 2026 11:37

dd-octo-sts Bot pushed a commit that referenced this pull request Jul 14, 2026

fix(test-optimization): omit empty FTR capture containers (#9304)

fd015dc

dd-octo-sts Bot mentioned this pull request Jul 14, 2026

v6.2.1 proposal #9300

Closed

dd-octo-sts Bot pushed a commit that referenced this pull request Jul 14, 2026

fix(test-optimization): omit empty FTR capture containers (#9304)

b5a3fec

This was referenced Jul 14, 2026

v5.113.1 proposal #9301

Closed

v6.3.0 proposal #9333

Merged

v5.114.0 proposal #9334

Merged

juan-fernandez added a commit that referenced this pull request Jul 14, 2026

fix(test-optimization): omit empty FTR capture containers (#9304)

6482c9e

juan-fernandez added a commit that referenced this pull request Jul 14, 2026

fix(test-optimization): omit empty FTR capture containers (#9304)

84530a8

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What does this PR do?

Motivation

Additional Notes

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dd-octo-sts Bot commented Jul 13, 2026

Overall package size

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Benchmarks

Explanation

More details about the CI and significant changes

Unstable benchmarks

scenario:appsec-appsec-enabled-24

scenario:appsec-appsec-enabled-26

scenario:appsec-appsec-enabled-with-attacks-24

scenario:appsec-appsec-enabled-with-attacks-26

scenario:appsec-control-20

scenario:appsec-control-24

scenario:appsec-control-26

scenario:appsec-iast-no-vulnerability-control-20

scenario:appsec-iast-no-vulnerability-iast-enabled-always-active-20

scenario:appsec-iast-with-vulnerability-control-20

scenario:appsec-iast-with-vulnerability-iast-enabled-always-active-20

scenario:debugger-line-probe-with-snapshot-default-24

scenario:debugger-line-probe-with-snapshot-default-26

scenario:debugger-line-probe-with-snapshot-minimal-24

scenario:debugger-line-probe-with-snapshot-minimal-26

scenario:debugger-line-probe-without-snapshot-24

scenario:debugger-line-probe-without-snapshot-26

scenario:dogstatsd-with-tags-20

scenario:plugin-aws-sdk-lambda-inject-with-context-24

scenario:plugin-graphql-long-with-depth-off-20

scenario:plugin-graphql-long-with-depth-on-max-20

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juan-fernandez commented Jul 13, 2026 •

edited

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datadog-official Bot commented Jul 13, 2026 •

edited by datadog-prod-us1-6 Bot

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pr-commenter Bot commented Jul 13, 2026 •

edited

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codecov Bot commented Jul 13, 2026 •

edited

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