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refactor(debugger): drop unused snapshot probe index#8969

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watson/remove-dead-code
Jun 18, 2026
Merged

refactor(debugger): drop unused snapshot probe index#8969
watson merged 1 commit into
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watson/remove-dead-code

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@watson

@watson watson commented Jun 17, 2026

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What does this PR do?

Removes the now-unused snapshot probe index bookkeeping from the dynamic instrumentation devtools client. Snapshot probes are already processed through the sampled probe list, so the extra index buffer and Node.js 20 resizable ArrayBuffer path are dead code.

Motivation

This cleanup was missed in #8967, which moved probe sampling into generated breakpoint conditions and reads sampled probe indexes from the sampler buffer instead.

watson commented Jun 17, 2026

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@dd-octo-sts

dd-octo-sts Bot commented Jun 17, 2026

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Overall package size

Self size: 6.25 MB
Deduped: 7.31 MB
No deduping: 7.31 MB

Dependency sizes | name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.1.0 | 101.28 kB | 840.46 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

@codecov

codecov Bot commented Jun 17, 2026

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.36%. Comparing base (c882011) to head (e2e691d).

Files with missing lines Patch % Lines
...ges/dd-trace/src/debugger/devtools_client/index.js 0.00% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##           master    #8969      +/-   ##
==========================================
+ Coverage   92.99%   93.36%   +0.36%     
==========================================
  Files         874      877       +3     
  Lines       50169    50267      +98     
  Branches     9871     9871              
==========================================
+ Hits        46653    46930     +277     
+ Misses       3516     3337     -179     
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test-optimization-cypress-latest-12.0.0-esm 49.29% <ø> (+0.07%) ⬆️
test-optimization-cypress-latest-14.5.4-commonJS 49.11% <ø> (+3.25%) ⬆️
test-optimization-cypress-latest-14.5.4-esm 49.14% <ø> (+0.38%) ⬆️
test-optimization-cypress-latest-latest-commonJS 47.83% <ø> (-1.39%) ⬇️
test-optimization-cypress-latest-latest-esm 49.63% <ø> (+0.07%) ⬆️
test-optimization-cypress-oldest-12.0.0-commonJS 49.35% <ø> (+0.59%) ⬆️
test-optimization-cypress-oldest-12.0.0-esm 49.38% <ø> (+0.10%) ⬆️
test-optimization-cypress-oldest-14.5.4-commonJS 49.20% <ø> (+1.51%) ⬆️
test-optimization-cypress-oldest-14.5.4-esm 49.23% <ø> (+0.07%) ⬆️
test-optimization-jest-latest-latest 55.36% <ø> (+0.08%) ⬆️
test-optimization-jest-latest-oldest 54.29% <ø> (+0.78%) ⬆️
test-optimization-jest-oldest-latest 55.41% <ø> (+0.08%) ⬆️
test-optimization-jest-oldest-oldest 54.30% <ø> (+0.08%) ⬆️
test-optimization-mocha-latest-latest 53.61% <ø> (+0.08%) ⬆️
test-optimization-mocha-latest-oldest 51.16% <ø> (+0.08%) ⬆️
test-optimization-mocha-oldest-latest 53.71% <ø> (+0.06%) ⬆️
test-optimization-mocha-oldest-oldest 51.15% <ø> (+0.08%) ⬆️
test-optimization-playwright-latest-latest-playwright-active-test-span 44.23% <ø> (+0.41%) ⬆️
test-optimization-playwright-latest-latest-playwright-atr 42.86% <ø> (+0.10%) ⬆️
test-optimization-playwright-latest-latest-playwright-efd 43.28% <ø> (+0.06%) ⬆️
test-optimization-playwright-latest-latest-playwright-final-status 43.37% <ø> (?)
test-optimization-playwright-latest-latest-playwright-impacted-tests 42.83% <ø> (ø)
test-optimization-playwright-latest-latest-playwright-reporting ?
test-optimization-playwright-latest-latest-playwright-test-management ?
test-optimization-playwright-latest-oldest-playwright-active-test-span 44.05% <ø> (+0.27%) ⬆️
test-optimization-playwright-latest-oldest-playwright-atr 42.94% <ø> (+0.10%) ⬆️
test-optimization-playwright-latest-oldest-playwright-efd 43.23% <ø> (+0.09%) ⬆️
test-optimization-playwright-latest-oldest-playwright-final-status 43.28% <ø> (+0.10%) ⬆️
test-optimization-playwright-latest-oldest-playwright-impacted-tests 42.75% <ø> (ø)
test-optimization-playwright-latest-oldest-playwright-reporting 42.69% <ø> (+0.06%) ⬆️
test-optimization-playwright-latest-oldest-playwright-test-management 44.45% <ø> (+0.10%) ⬆️
test-optimization-playwright-oldest-latest-playwright-active-test-span 44.31% <ø> (+0.11%) ⬆️
test-optimization-playwright-oldest-latest-playwright-atr 42.94% <ø> (+0.08%) ⬆️
test-optimization-playwright-oldest-latest-playwright-efd ?
test-optimization-playwright-oldest-latest-playwright-final-status 43.42% <ø> (?)
test-optimization-playwright-oldest-latest-playwright-impacted-tests 42.91% <ø> (ø)
test-optimization-playwright-oldest-latest-playwright-reporting 42.95% <ø> (+0.08%) ⬆️
test-optimization-playwright-oldest-latest-playwright-test-management 44.56% <ø> (+0.06%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-active-test-span 44.13% <ø> (+0.27%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-atr 43.02% <ø> (+0.10%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-efd 43.29% <ø> (+0.09%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-final-status 43.39% <ø> (+0.13%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-impacted-tests 42.84% <ø> (ø)
test-optimization-playwright-oldest-oldest-playwright-reporting 42.77% <ø> (+0.09%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-test-management 44.54% <ø> (+0.10%) ⬆️
test-optimization-selenium-latest 45.20% <ø> (+0.06%) ⬆️
test-optimization-selenium-oldest 44.77% <ø> (+0.07%) ⬆️
test-optimization-testopt-active 48.28% <ø> (+0.12%) ⬆️
test-optimization-testopt-latest 48.28% <ø> (+0.12%) ⬆️
test-optimization-testopt-maintenance 48.27% <ø> (+0.13%) ⬆️
test-optimization-testopt-oldest 49.37% <ø> (+0.10%) ⬆️
test-optimization-vitest-latest 50.82% <ø> (+0.10%) ⬆️
test-optimization-vitest-oldest 48.04% <ø> (+0.29%) ⬆️

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@datadog-datadog-prod-us1-2

datadog-datadog-prod-us1-2 Bot commented Jun 17, 2026

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Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

This comment will be updated automatically if new data arrives.
🔗 Commit SHA: e2e691d | Docs | Datadog PR Page | Give us feedback!

@pr-commenter

pr-commenter Bot commented Jun 17, 2026

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Benchmarks

Benchmark execution time: 2026-06-18 14:03:23

Comparing candidate commit e2e691d in PR branch watson/remove-dead-code with baseline commit c882011 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1952 metrics, 13 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 [-151.752ms; +155.161ms] or [-5.837%; +5.968%]

scenario:appsec-appsec-enabled-26

  • unstable execution_time [-172.756ms; +158.647ms] or [-6.978%; +6.408%]

scenario:appsec-control-20

  • unstable execution_time [-118.234ms; +135.177ms] or [-6.871%; +7.856%]

scenario:appsec-control-24

  • unstable execution_time [-89.795ms; +92.457ms] or [-7.529%; +7.752%]

scenario:appsec-control-26

  • unstable execution_time [-95955.766µs; +96330.200µs] or [-8.135%; +8.167%]

scenario:dogstatsd-with-tags-20

  • unstable cpu_user_time [-300.230ms; +354.901ms] or [-6.098%; +7.209%]
  • unstable execution_time [-297.885ms; +354.102ms] or [-5.960%; +7.085%]

scenario:plugin-graphql-long-with-depth-and-collapse-off-24

  • unstable cpu_user_time [-240.053ms; +487.254ms] or [-5.515%; +11.195%]
  • unstable execution_time [-255.098ms; +519.779ms] or [-5.504%; +11.215%]
  • unstable max_rss_usage [-24.485MB; +53.700MB] or [-4.646%; +10.190%]

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

  • unstable max_rss_usage [-11.677MB; +8.149MB] or [-8.387%; +5.853%]

scenario:spans-finish-later-26

  • unstable max_rss_usage [-12.375MB; +18.691MB] or [-7.351%; +11.102%]

scenario:test-optimization-large-suite-20

  • unstable max_rss_usage [-3.539MB; +10.437MB] or [-4.267%; +12.586%]

@watson
watson force-pushed the watson/remove-dead-code branch from eb0fd43 to 5793b97 Compare June 18, 2026 12:03
@watson
watson force-pushed the watson/keep-breakpoint-id-in-sync branch from 7323631 to 5ccd11f Compare June 18, 2026 12:03
Base automatically changed from watson/keep-breakpoint-id-in-sync to master June 18, 2026 12:14
@github-actions github-actions Bot added semver-patch debugger Dynamic Instrumentation & Live Debugger labels Jun 18, 2026
The probe sampling refactor in #8967 moved sampled probe tracking into the
sampler buffer, but left behind the old snapshot probe index bookkeeping.

Remove the dead resizeable ArrayBuffer path and Node.js version gate from the
paused debugger handler.
@watson
watson force-pushed the watson/remove-dead-code branch from 5793b97 to e2e691d Compare June 18, 2026 13:49
@watson
watson marked this pull request as ready for review June 18, 2026 13:50
@watson
watson requested a review from a team as a code owner June 18, 2026 13:50
@watson
watson requested a review from a team June 18, 2026 13:50
@watson
watson merged commit 9b73d99 into master Jun 18, 2026
800 of 801 checks passed
@watson
watson deleted the watson/remove-dead-code branch June 18, 2026 15:45
tlhunter pushed a commit that referenced this pull request Jun 18, 2026
The probe sampling refactor in #8967 moved sampled probe tracking into the
sampler buffer, but left behind the old snapshot probe index bookkeeping.

Remove the dead resizeable ArrayBuffer path and Node.js version gate from the
paused debugger handler.
dd-octo-sts Bot pushed a commit that referenced this pull request Jun 19, 2026
The probe sampling refactor in #8967 moved sampled probe tracking into the
sampler buffer, but left behind the old snapshot probe index bookkeeping.

Remove the dead resizeable ArrayBuffer path and Node.js version gate from the
paused debugger handler.
@dd-octo-sts dd-octo-sts Bot mentioned this pull request Jun 19, 2026
@dd-octo-sts dd-octo-sts Bot mentioned this pull request Jun 26, 2026
pabloerhard pushed a commit that referenced this pull request Jun 26, 2026
The probe sampling refactor in #8967 moved sampled probe tracking into the
sampler buffer, but left behind the old snapshot probe index bookkeeping.

Remove the dead resizeable ArrayBuffer path and Node.js version gate from the
paused debugger handler.
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