fix(vitest): stop propagating metadata to workers by juan-fernandez · Pull Request #9261 · DataDog/dd-trace-js

juan-fernandez · 2026-07-08T15:26:08Z

What does this PR do?

Stops propagating Vitest testEnvironmentMetadata through worker providedContext.

Vitest worker context still carries the IDs, command, repository root, and CODEOWNERS entries needed to attach worker-reported suites to the main test session. Worker-created spans keep using their local Test Optimization metadata, while the main process still uses its own metadata for DI log export and backfills git.* tags onto worker traces.

Motivation

Fixes #9259.

The regression was caused by commit 63c2b0c2c (fix(test-optimization): propagate vitest worker metadata), which was part of PR #9193: #9193.

That change started sending testEnvironmentMetadata through Vitest providedContext so worker-reported suites could reuse main-process CI/Git metadata. That metadata can include DD_GIT_COMMIT_MESSAGE; if the commit message contains an emoji, the worker context can contain UTF-16 surrogate code units.

Under @cloudflare/vitest-pool-workers 0.12.x with Vitest 3.2.x, Vitest provided context crosses Miniflare internal fetch/Request boundaries as a header value. Undici validates request header values as ByteString, so a surrogate from the emoji-containing DD_GIT_COMMIT_MESSAGE value can throw before tests start.

Additional Notes

Added a regression test using [email protected] with @cloudflare/[email protected], matching the affected Vitest 3 Cloudflare worker-pool path. The test sets DD_GIT_COMMIT_MESSAGE to a value containing an emoji to trigger the original failure deterministically.

Regression proof: temporarily restoring the old testEnvironmentMetadata handoff makes the Cloudflare/Vitest 3 integration test fail with Cannot convert argument to a ByteString... in Miniflare's Request path; removing the handoff makes it pass.

Local validation also covered linting for the touched files and test-script coverage for the new fixture. Full repo lint is still blocked locally by the existing vendor dependency state: vendor/node_modules/@apm-js-collab/[email protected] is marked invalid for ^0.15.0.

dd-octo-sts · 2026-07-08T15:27:04Z

Overall package size

Self size: 6.68 MB
Deduped: 7.34 MB
No deduping: 7.34 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.3.1 | 122.62 kB | 437.94 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 · 2026-07-08T15:29:32Z

Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 1 job - 1 passed on retry

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

🔗 Commit SHA: 1b2b825 | Docs | Datadog PR Page | Give us feedback!}

pr-commenter · 2026-07-08T15:47:05Z

Benchmarks

Benchmark execution time: 2026-07-09 11:36:08

Comparing candidate commit 1b2b825 in PR branch juan-fernandez/fix-vitest-context-bytestring with baseline commit fa7a23a in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2307 metrics, 51 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 [-215.005ms; +209.058ms] or [-8.055%; +7.832%]

scenario:appsec-appsec-enabled-26

unstable execution_time [-230.767ms; +235.999ms] or [-9.047%; +9.252%]

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

unstable execution_time [-162.132ms; +157.093ms] or [-5.227%; +5.065%]

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

unstable execution_time [-188.150ms; +193.955ms] or [-6.464%; +6.664%]

scenario:appsec-control-20

unstable execution_time [-121.498ms; +129.847ms] or [-7.412%; +7.922%]

scenario:appsec-control-24

unstable execution_time [-119.508ms; +105.156ms] or [-9.695%; +8.531%]

scenario:appsec-control-26

unstable execution_time [-130.654ms; +121.116ms] or [-10.569%; +9.798%]

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

unstable execution_time [-13.671ms; +16.678ms] or [-5.296%; +6.461%]

scenario:appsec-iast-no-vulnerability-iast-enabled-default-config-20

unstable execution_time [-10.367ms; +15.602ms] or [-4.116%; +6.194%]

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

unstable execution_time [-28.310ms; +30.350ms] or [-5.127%; +5.496%]

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

unstable execution_time [-29.813ms; +32.882ms] or [-5.367%; +5.919%]

scenario:appsec-iast-with-vulnerability-iast-enabled-default-config-20

unstable execution_time [-25.043ms; +31.074ms] or [-4.581%; +5.685%]

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

unstable cpu_user_time [-2577.841ms; +3560.711ms] or [-24.218%; +33.451%]
unstable execution_time [-2563.309ms; +3562.505ms] or [-22.534%; +31.319%]
unstable instructions [-22.0G instructions; +30.6G instructions] or [-25.108%; +34.898%]
unstable max_rss_usage [-10.812MB; +15.726MB] or [-6.502%; +9.457%]
unstable throughput [-950.690op/s; +659.656op/s] or [-31.760%; +22.037%]

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

unstable cpu_user_time [-2035.213ms; +3356.901ms] or [-21.769%; +35.907%]
unstable execution_time [-2052.407ms; +3343.669ms] or [-20.397%; +33.230%]
unstable instructions [-18.2G instructions; +29.8G instructions] or [-23.419%; +38.313%]
unstable max_rss_usage [-5.823MB; +10.658MB] or [-3.649%; +6.679%]
unstable throughput [-734.188op/s; +442.091op/s] or [-22.494%; +13.545%]

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

unstable cpu_user_time [-2025.436ms; +3043.208ms] or [-23.844%; +35.825%]
unstable execution_time [-2008.361ms; +3067.302ms] or [-21.860%; +33.386%]
unstable instructions [-16.9G instructions; +25.5G instructions] or [-24.390%; +36.758%]
unstable max_rss_usage [-8.680MB; +13.213MB] or [-5.525%; +8.410%]
unstable throughput [-807.230op/s; +541.570op/s] or [-22.541%; +15.123%]

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

unstable cpu_user_time [-1854.955ms; +577.633ms] or [-19.795%; +6.164%]
unstable execution_time [-1871.055ms; +570.011ms] or [-18.545%; +5.650%]
unstable instructions [-16.6G instructions; +5.1G instructions] or [-21.244%; +6.594%]
unstable throughput [-126.721op/s; +422.872op/s] or [-3.895%; +12.996%]

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

unstable cpu_user_time [-3079.238ms; +2346.941ms] or [-32.533%; +24.796%]
unstable execution_time [-3171.300ms; +2397.541ms] or [-31.172%; +23.566%]
unstable instructions [-26.2G instructions; +19.8G instructions] or [-33.626%; +25.443%]
unstable max_rss_usage [-13.919MB; +9.259MB] or [-8.612%; +5.729%]
unstable throughput [-641.015op/s; +835.300op/s] or [-19.292%; +25.139%]

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

unstable cpu_user_time [-2.524s; +5.209s] or [-24.890%; +51.364%]
unstable execution_time [-2.624s; +5.307s] or [-24.109%; +48.758%]
unstable instructions [-21.8G instructions; +46.2G instructions] or [-25.601%; +54.313%]
unstable max_rss_usage [-7.486MB; +15.718MB] or [-4.649%; +9.761%]
unstable throughput [-1077.943op/s; +554.015op/s] or [-34.765%; +17.868%]

scenario:dogstatsd-with-tags-20

unstable cpu_user_time [-235.366ms; +473.942ms] or [-4.790%; +9.645%]
unstable execution_time [-235.840ms; +471.825ms] or [-4.726%; +9.454%]
unstable throughput [-162257.520op/s; +82251.887op/s] or [-9.637%; +4.885%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-24

unstable cpu_usage_percentage [-7.016%; +3.440%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-26

unstable cpu_usage_percentage [-6.046%; +4.911%]

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

unstable max_rss_usage [-11.023MB; +5.287MB] or [-8.275%; +3.969%]

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

unstable cpu_user_time [-738.748ms; +676.438ms] or [-5.795%; +5.307%]
unstable execution_time [-744.760ms; +685.982ms] or [-5.715%; +5.264%]
unstable throughput [-3.212op/s; +3.482op/s] or [-5.199%; +5.638%]

scenario:test-optimization-large-suite-20

unstable max_rss_usage [-5160.285KB; +3418.618KB] or [-6.432%; +4.261%]

codecov · 2026-07-08T16:02:58Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.56%. Comparing base (fa7a23a) to head (1b2b825).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9261      +/-   ##
==========================================
+ Coverage   96.55%   96.56%   +0.01%     
==========================================
  Files         918      918              
  Lines      121410   121396      -14     
  Branches    20874    20664     -210     
==========================================
- Hits       117231   117230       -1     
+ Misses       4179     4166      -13

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…vitest-context-bytestring

datadog-official

More details

This PR correctly fixes a ByteString validation error in Cloudflare worker pools by stopping propagation of testEnvironmentMetadata through Vitest's providedContext. The fix is safe: workers never accessed this field, and the main process retains its own metadata for backfilling git tags onto worker traces during span preparation. Test coverage includes a regression test with emoji-containing commit messages that would have failed before the fix.

Was this helpful? React 👍 or 👎

_{📊 Validated against 3 scenarios · Open Bits AI session}

_{🤖 Datadog Autotest · Commit 79ac97e · What is Autotest? · Any feedback? Reach out in #autotest}

juan-fernandez · 2026-07-09T10:27:37Z

@codex review

chatgpt-codex-connector · 2026-07-09T10:33:42Z

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

Reviewed commit: 79ac97eaa1

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github-actions Bot added the semver-patch label Jul 8, 2026

juan-fernandez mentioned this pull request Jul 8, 2026

[BUG]: dd-trace 6.1.0 intermittently breaks Vitest tests under @cloudflare/vitest-pool-workers with ByteString header error #9259

Closed

juan-fernandez force-pushed the juan-fernandez/fix-vitest-context-bytestring branch from 5ea9907 to c88309b Compare July 8, 2026 15:45

juan-fernandez changed the title ~~fix(vitest): encode provided context for workers~~ fix(vitest): stop propagating metadata to workers Jul 8, 2026

juan-fernandez force-pushed the juan-fernandez/fix-vitest-context-bytestring branch 2 times, most recently from e814654 to 5bfb2c1 Compare July 9, 2026 08:13

fix(vitest): stop propagating metadata to workers

c736154

juan-fernandez force-pushed the juan-fernandez/fix-vitest-context-bytestring branch from 5bfb2c1 to c736154 Compare July 9, 2026 08:29

juan-fernandez added 2 commits July 9, 2026 10:33

Merge remote-tracking branch 'origin/master' into juan-fernandez/fix-…

41db436

…vitest-context-bytestring

test(vitest): explain Cloudflare metadata trigger

79ac97e

juan-fernandez added the test-optimization label Jul 9, 2026

juan-fernandez marked this pull request as ready for review July 9, 2026 10:13

juan-fernandez requested review from a team as code owners July 9, 2026 10:13

juan-fernandez requested review from crysmags and removed request for a team July 9, 2026 10:13

datadog-official Bot reviewed Jul 9, 2026

View reviewed changes

cbasitodx approved these changes Jul 9, 2026

View reviewed changes

Merge branch 'master' into juan-fernandez/fix-vitest-context-bytestring

1b2b825

juan-fernandez enabled auto-merge (squash) July 9, 2026 11:23

juan-fernandez merged commit 7589a18 into master Jul 9, 2026
744 of 746 checks passed

juan-fernandez deleted the juan-fernandez/fix-vitest-context-bytestring branch July 9, 2026 11:41

dd-octo-sts Bot pushed a commit that referenced this pull request Jul 10, 2026

fix(vitest): stop propagating metadata to workers (#9261)

8588aa1

dd-octo-sts Bot mentioned this pull request Jul 10, 2026

v6.2.0 proposal #9274

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dd-octo-sts Bot pushed a commit that referenced this pull request Jul 10, 2026

fix(vitest): stop propagating metadata to workers (#9261)

699ad65

dd-octo-sts Bot mentioned this pull request Jul 10, 2026

v5.113.0 proposal #9275

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juan-fernandez added a commit that referenced this pull request Jul 10, 2026

fix(vitest): stop propagating metadata to workers (#9261)

0841cb0

juan-fernandez added a commit that referenced this pull request Jul 10, 2026

fix(vitest): stop propagating metadata to workers (#9261)

a34bf2e

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juan-fernandez commented Jul 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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What does this PR do?

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Benchmarks

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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-iast-enabled-always-active-20

scenario:appsec-iast-no-vulnerability-iast-enabled-default-config-20

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

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

scenario:appsec-iast-with-vulnerability-iast-enabled-default-config-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-claude-agent-sdk-compact-stream-scan-24

scenario:plugin-claude-agent-sdk-compact-stream-scan-26

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

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

scenario:test-optimization-large-suite-20

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juan-fernandez commented Jul 9, 2026

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juan-fernandez commented Jul 8, 2026 •

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