libdatadog update to 7b8cb2a7

[dd-octo-sts]

Summary

Automated update of the libdatadog submodule to the latest HEAD.

	SHA
Previous	$LIBDATADOG_PINNED_SHA
New	7b8cb2a77344a2207483dfb0950b4efa6df5b66f

Full CI result: ❌ 133 job(s) failed
CI pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-php/-/pipelines/128441095

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(Claude did not produce a report — see tmp/artifacts/claude_output.txt in the CI pipeline.)

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/cc @bwoebi

[datadog-datadog-prod-us1-2]

 

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⚠️ Warnings

🚦 203 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-php | Cargo test     

DataDog/apm-reliability/dd-trace-php | PHP language tests: [7.1, amd64, nts]     

DataDog/apm-reliability/dd-trace-php | PHP language tests: [7.1, amd64, zts]     

View all 203 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 2 jobs - 0 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 60.65% (-0.03%)

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Benchmarks [ tracer ]

Benchmark execution time: 2026-08-01 04:51:01

Comparing candidate commit 82662b3 in PR branch bot/libdatadog-latest with baseline commit af463f7 in branch master.

Found 3 performance improvements and 0 performance regressions! Performance is the same for 191 metrics, 0 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 ----------------------------------'

scenario:MessagePackSerializationBench/benchMessagePackSerialization

• 🟩 execution_time [-10.769µs; -8.751µs] or [-9.715%; -7.895%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟩 execution_time [-10.172µs; -8.388µs] or [-8.947%; -7.378%]

scenario:SpanBench/benchDatadogAPI-opcache

• 🟩 execution_time [-90.976µs; -89.514µs] or [-57.709%; -56.782%]