fix(opentelemetry): wait for trace delivery in forceFlush

[BridgeAR]

This fixes OpenTelemetry TracerProvider.forceFlush() resolving before Datadog trace delivery completes. The provider now waits for the exporter's completion-aware flush boundary and every configured span processor, including delayed HTTP responses and overlapping flush generations.

Exporter failures remain observable through the OpenTelemetry promise contract, while legacy background flushes keep swallowing errors; OTLP and serverless delivery paths use the same boundary without retaining completed failures.

[dd-octo-sts]

Overall package size

Self size: 8.74 MB
Deduped: 9.41 MB
No deduping: 9.41 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.4.0 | 127.33 kB | 447.04 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-datadog-prod-us1-2]

✅ All CI checks and tests passed.

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 98.57% (-0.06%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 87d24e7 | Docs | View more details | Give us feedback!}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.57%. Comparing base (6e65a91) to head (87d24e7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10131      +/-   ##
==========================================
- Coverage   98.63%   98.57%   -0.07%     
==========================================
  Files        1002     1003       +1     
  Lines      154897   155032     +135     
  Branches    13358    13548     +190     
==========================================
+ Hits       152779   152819      +40     
- Misses       2118     2213      +95     

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instr-url_instrumentation-when_instr-22ca7078	56.46% <62.31%> (-0.03%)	⬇️
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master-coverage	98.57% <100.00%> (?)
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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-09-03 11:45:41

Comparing candidate commit 87d24e7 in PR branch BridgeAR/2026-09-03-otel-force-flush with baseline commit 6e65a91 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2314 metrics, 14 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 max_rss_usage [-43.557MB; +40.626MB] or [-14.769%; +13.775%]

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

• unstable max_rss_usage [-12.111MB; +21.736MB] or [-5.294%; +9.502%]

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

• unstable max_rss_usage [-18.937MB; +25.405MB] or [-4.973%; +6.672%]

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

• unstable max_rss_usage [-15.908MB; +11.612MB] or [-6.335%; +4.624%]

scenario:dogstatsd-with-tags-20

• unstable cpu_user_time [-364.046ms; +366.300ms] or [-7.228%; +7.273%]
• unstable execution_time [-367969.637µs; +366836.221µs] or [-7.192%; +7.169%]
• unstable throughput [-122040.157op/s; +123343.788op/s] or [-7.433%; +7.513%]

scenario:encoders-0.4-immediate-flush-20

• unstable max_rss_usage [-11.436MB; +5.790MB] or [-14.472%; +7.326%]

scenario:llmobs-encode-unicode-mixed-20

• unstable max_rss_usage [-13.369MB; -2.788MB] or [-17.888%; -3.731%]

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

• unstable max_rss_usage [-5.155MB; +10.293MB] or [-4.163%; +8.313%]

scenario:plugin-pg-service-20

• unstable cpu_usage_percentage [-10.992%; +6.580%]
• unstable execution_time [-175.713ms; +292.495ms] or [-10.606%; +17.656%]
• unstable throughput [-385244.779op/s; +236483.976op/s] or [-10.458%; +6.420%]

scenario:test-optimization-large-suite-20

• unstable max_rss_usage [-4.500MB; +7.516MB] or [-5.564%; +9.293%]