fix(test-optimization): use a 10-second flush interval

[juan-fernandez]

What does this PR do?

Changes the default Test Optimization periodic flush interval from 5 seconds to 10 seconds. Jest workers keep their existing zero interval.

Motivation

A longer periodic interval reduces small payload request frequency and gives the encoder more opportunity to batch events. The encoder size gate and final flush continue to send data independently of this interval.

This was extracted from #9987 so the two-line configuration change can be reviewed separately while #9987 remains the combined E2E validation branch. #10017 has merged, and this PR is now based directly on master.

Additional Notes

Verification:

• 9 Test Optimization validation-initialization unit tests
• ESLint and git diff --check

[dd-octo-sts]

Overall package size

Self size: 8.42 MB
Deduped: 9.09 MB
No deduping: 9.09 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.3.3 | 125.43 kB | 445.14 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]

✅ All CI checks and tests passed. Datadog automation helped this PR pass.

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog retried 1 test - 1 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 98.59% (-0.00%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: dac7e36 | Docs | View more details | Give us feedback!}

[datadog-official]

More details

The default flush interval changes to 10 seconds. The Jest worker interval stays at zero, and the test expectation matches the source value.

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-08-28 08:42:57

Comparing candidate commit dac7e36 in PR branch juan-fernandez/use-10s-test-optimization-flush-interval with baseline commit d140900 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2299 metrics, 11 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-20

• unstable max_rss_usage [-18.115MB; +5.017MB] or [-10.424%; +2.887%]

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

• unstable max_rss_usage [-17.229MB; +25.061MB] or [-7.591%; +11.041%]

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

• unstable max_rss_usage [-21.370MB; +26.667MB] or [-5.787%; +7.222%]

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

• unstable max_rss_usage [-12413.472KB; +14178.272KB] or [-4.689%; +5.355%]

scenario:dogstatsd-with-tags-20

• unstable cpu_user_time [-229.552ms; +441.462ms] or [-4.763%; +9.160%]
• unstable execution_time [-229.857ms; +446.378ms] or [-4.693%; +9.113%]
• unstable throughput [-160090.638op/s; +82734.732op/s] or [-9.335%; +4.825%]

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

• unstable cpu_user_time [-734.448ms; +978.258ms] or [-6.351%; +8.459%]
• unstable execution_time [-751.770ms; +999.545ms] or [-6.373%; +8.474%]
• unstable throughput [-5.176op/s; +4.125op/s] or [-7.573%; +6.035%]

scenario:test-optimization-large-suite-20

• unstable max_rss_usage [-4.188MB; +9.134MB] or [-5.125%; +11.179%]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (d140900) to head (dac7e36).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10018      +/-   ##
==========================================
+ Coverage   91.95%   98.58%   +6.63%     
==========================================
  Files         973      991      +18     
  Lines      144660   149346    +4686     
  Branches    10796    12923    +2127     
==========================================
+ Hits       133021   147236   +14215     
+ Misses      11639     2110    -9529     

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[juan-fernandez]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

Reviewed commit: f6a076ada3

ℹ️ About Codex in GitHub

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• Open a pull request for review
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• Comment "@codex review".

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Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[datadog-official]

Older Agent paths can receive test and suite events in one trace. The new export path drops the full trace and loses the test event.

_{Open Bits AI session}

_{🤖 Datadog Autotest · Commit 015f5c1 · What is Autotest? · @DataDog review to ask questions · Any feedback? Reach out in #autotest}

[juan-fernandez]

@codex review

[juan-fernandez]

/datadog autotest review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: dac7e36c08

ℹ️ About Codex in GitHub

Your team has set up Codex to 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 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[datadog-official]

More details

This PR changes the default Test Optimization flush interval from 5 seconds to 10 seconds.
Jest workers keep the zero interval.
The current PR diff contains only this change and its test update.
The current base fixes the earlier mixed-trace event loss.
No open findings remain.

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