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bench(span-format): add per-span tag formatting benchmark#8876

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BridgeAR/2026-06-11-bench-span-format
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bench(span-format): add per-span tag formatting benchmark#8876
BridgeAR wants to merge 1 commit into
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BridgeAR/2026-06-11-bench-span-format

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Summary

Adds a sirun microbenchmark for the per-span tag formatting path that runs on every span before encode. Benchmark-only; no shipped code changes.

@dd-octo-sts

dd-octo-sts Bot commented Jun 11, 2026

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Overall package size

Self size: 6.19 MB
Deduped: 7.24 MB
No deduping: 7.24 MB

Dependency sizes | name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.0.2 | 85.93 kB | 825.11 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 11, 2026

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.76%. Comparing base (ef87455) to head (25a335f).

Additional details and impacted files
@@            Coverage Diff             @@
##           master    #8876      +/-   ##
==========================================
+ Coverage   91.96%   92.76%   +0.80%     
==========================================
  Files         862      861       -1     
  Lines       49627    49605      -22     
  Branches     9404     9404              
==========================================
+ Hits        45639    46017     +378     
+ Misses       3988     3588     -400     
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test-optimization-mocha-latest-oldest 51.22% <ø> (+0.08%) ⬆️
test-optimization-mocha-oldest-latest 53.78% <ø> (+0.08%) ⬆️
test-optimization-mocha-oldest-oldest 51.21% <ø> (+0.08%) ⬆️
test-optimization-playwright-latest-latest-playwright-active-test-span 44.27% <ø> (+0.27%) ⬆️
test-optimization-playwright-latest-latest-playwright-atr 42.85% <ø> (+0.07%) ⬆️
test-optimization-playwright-latest-latest-playwright-efd 43.34% <ø> (?)
test-optimization-playwright-latest-latest-playwright-final-status 43.40% <ø> (+0.10%) ⬆️
test-optimization-playwright-latest-latest-playwright-impacted-tests 42.86% <ø> (ø)
test-optimization-playwright-latest-latest-playwright-reporting 42.93% <ø> (+0.08%) ⬆️
test-optimization-playwright-latest-latest-playwright-test-management 44.54% <ø> (+0.10%) ⬆️
test-optimization-playwright-latest-oldest-playwright-active-test-span 44.08% <ø> (+0.27%) ⬆️
test-optimization-playwright-latest-oldest-playwright-atr 42.97% <ø> (+0.10%) ⬆️
test-optimization-playwright-latest-oldest-playwright-efd 43.24% <ø> (+0.09%) ⬆️
test-optimization-playwright-latest-oldest-playwright-final-status 43.31% <ø> (+0.11%) ⬆️
test-optimization-playwright-latest-oldest-playwright-impacted-tests 42.78% <ø> (ø)
test-optimization-playwright-latest-oldest-playwright-reporting 42.74% <ø> (+0.09%) ⬆️
test-optimization-playwright-latest-oldest-playwright-test-management 44.49% <ø> (+0.10%) ⬆️
test-optimization-playwright-oldest-latest-playwright-active-test-span 44.33% <ø> (+0.08%) ⬆️
test-optimization-playwright-oldest-latest-playwright-atr 42.97% <ø> (+0.08%) ⬆️
test-optimization-playwright-oldest-latest-playwright-efd 43.39% <ø> (+0.09%) ⬆️
test-optimization-playwright-oldest-latest-playwright-final-status 43.46% <ø> (+0.09%) ⬆️
test-optimization-playwright-oldest-latest-playwright-impacted-tests 42.94% <ø> (?)
test-optimization-playwright-oldest-latest-playwright-reporting 42.98% <ø> (+0.08%) ⬆️
test-optimization-playwright-oldest-latest-playwright-test-management 44.60% <ø> (?)
test-optimization-playwright-oldest-oldest-playwright-active-test-span 44.17% <ø> (+0.27%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-atr 43.05% <ø> (+0.10%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-efd 43.33% <ø> (+0.09%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-final-status 43.39% <ø> (+0.11%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-impacted-tests 42.87% <ø> (?)
test-optimization-playwright-oldest-oldest-playwright-reporting 42.80% <ø> (+0.09%) ⬆️
test-optimization-playwright-oldest-oldest-playwright-test-management 44.55% <ø> (+0.07%) ⬆️
test-optimization-selenium-latest 45.22% <ø> (+0.06%) ⬆️
test-optimization-selenium-oldest 44.80% <ø> (+0.07%) ⬆️
test-optimization-testopt-active 48.32% <ø> (+0.12%) ⬆️
test-optimization-testopt-latest 48.32% <ø> (?)
test-optimization-testopt-maintenance 48.31% <ø> (+0.13%) ⬆️
test-optimization-testopt-oldest 49.42% <ø> (+0.10%) ⬆️
test-optimization-vitest-latest 50.78% <ø> (+0.10%) ⬆️
test-optimization-vitest-oldest 47.99% <ø> (+0.32%) ⬆️

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@pr-commenter

pr-commenter Bot commented Jun 11, 2026

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Benchmarks

Benchmark execution time: 2026-06-11 17:48:40

Comparing candidate commit 6063279 in PR branch BridgeAR/2026-06-11-bench-span-format with baseline commit ef87455 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1510 metrics, 17 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:log-skip-log-24

  • unstable cpu_user_time [-2739.803µs; +2951.503µs] or [-5.639%; +6.075%]

scenario:log-without-log-20

  • unstable cpu_user_time [-1.718ms; +4.148ms] or [-3.147%; +7.596%]

scenario:log-without-log-24

  • unstable cpu_user_time [-1954.463µs; +3245.163µs] or [-4.178%; +6.937%]

scenario:log-without-log-26

  • unstable cpu_user_time [-4.221ms; +2.017ms] or [-9.190%; +4.391%]

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

  • unstable cpu_user_time [-263.530ms; +353.018ms] or [-6.052%; +8.107%]
  • unstable execution_time [-285.273ms; +377.690ms] or [-6.094%; +8.068%]
  • unstable max_rss_usage [-30.737MB; +44.232MB] or [-5.949%; +8.560%]

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

  • unstable max_rss_usage [-3.643MB; +13.801MB] or [-2.536%; +9.605%]

scenario:spans-finish-later-20

  • unstable cpu_user_time [-875.622ms; +191.703ms] or [-17.991%; +3.939%]
  • unstable execution_time [-1176.573ms; +178.421ms] or [-21.329%; +3.234%]
  • unstable instructions [-2.4G instructions; +0.1G instructions] or [-10.930%; +0.364%]

scenario:spans-finish-later-24

  • unstable cpu_user_time [-368.051ms; +574.134ms] or [-15.545%; +24.249%]
  • unstable execution_time [-374.411ms; +596.903ms] or [-14.748%; +23.511%]
  • unstable instructions [-684.9M instructions; +1081.4M instructions] or [-4.418%; +6.976%]
  • unstable max_rss_usage [-16.552MB; +44.399MB] or [-5.416%; +14.528%]

scenario:spans-finish-later-26

  • unstable cpu_user_time [-155.744ms; +90.616ms] or [-7.674%; +4.465%]
  • unstable execution_time [-155.430ms; +90.670ms] or [-7.234%; +4.220%]

@BridgeAR BridgeAR marked this pull request as ready for review June 11, 2026 17:15

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💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 25a335ff28

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

  • Open a pull request for review
  • Mark a draft as ready
  • Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".

Comment thread benchmark/sirun/span-format/index.js Outdated
Covers the per-span tag formatting path that runs on every span before encode.
@BridgeAR BridgeAR force-pushed the BridgeAR/2026-06-11-bench-span-format branch from 25a335f to 6063279 Compare June 11, 2026 17:34
@datadog-prod-us1-3

datadog-prod-us1-3 Bot commented Jun 11, 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: 6063279 | Docs | Datadog PR Page | Give us feedback!

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