refactor(llmobs): centralize session_id injection in handleLLMObsInjection by ncybul · Pull Request #9353 · DataDog/dd-trace-js

ncybul · 2026-07-14T21:00:40Z

What does this PR do?

Centralizes session_id cross-service injection into handleLLMObsInjection, so all four propagated LLMObs values (parent_id, ml_app, session_id, sampling) are emitted in one place.

Motivation

Follow-up to the session-propagation work (#9279). Session was handled on a different path from the other propagated values: it was stored on _trace.tags under the _dd.p.llmobs_sid key and injected implicitly by the standard propagator's _injectTags, while parent_id/ml_app are injected explicitly in handleLLMObsInjection.

It was also a subtle correctness gap: _injectTags only runs when the datadog inject propagation style is enabled, whereas handleLLMObsInjection runs regardless. So with a non-datadog inject style, session would silently stop propagating while parent_id/ml_app still did.

Changes

In-process trace default moves to an internal, non-_dd.p. key _ml_obs.trace_session_id (constant SESSION_ID_TRACE_DEFAULT_KEY). It is used only for in-process sibling inheritance, so the standard propagator no longer auto-injects it.
handleLLMObsInjection now emits _dd.p.llmobs_sid alongside parent_id/ml_app, reading the active span's session (mlObsSpanTags[SESSION_ID]) with fallbacks to the trace default and the extracted _dd.p.llmobs_sid.
registerLLMObsSpan resolves a new span's session as explicit → parent → in-process trace default → cross-service propagated.
_setTag seeds the internal trace-default key (first-writer-wins).

Testing

tagger.spec.js: trace-default establishment/inheritance/override updated to the internal key; added a case for inheriting an upstream-propagated session.
index.spec.js: added injection cases for session from the active span and from the trace-level default.
packages/dd-trace/test/llmobs/{tagger,index,sdk/index}.spec.js all pass (133 + 100).

Claude session: 3b93fe65-18d2-413f-b53e-2d95f370e1ed
Resume: claude --resume 3b93fe65-18d2-413f-b53e-2d95f370e1ed

🤖 Generated with Claude Code

dd-octo-sts · 2026-07-14T21:01:26Z

Overall package size

Self size: 6.77 MB
Deduped: 7.43 MB
No deduping: 7.43 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.3.1 | 122.62 kB | 438.86 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}

…ction Session_id was propagated via a separate path from the other LLMObs propagated values (parent_id, ml_app): it was stored on _trace.tags as a `_dd.p.*` tag and injected implicitly by the standard propagator, while the others are injected explicitly in handleLLMObsInjection. Per review feedback, handle all of them in one place. The in-process trace-level default now lives under an internal, non-`_dd.p.` key (_ml_obs.trace_session_id) for sibling inheritance only, and handleLLMObsInjection emits `_dd.p.llmobs_sid` alongside parent_id/ml_app. Session is now handled the same way as ml_app rather than as a standard-propagator special case. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

datadog-datadog-us1-prod · 2026-07-14T21:07:45Z

Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 96.61% (+0.01%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: 87b59eb | Docs | Datadog PR Page | Give us feedback!}

pr-commenter · 2026-07-14T21:18:07Z

Benchmarks

Benchmark execution time: 2026-07-15 14:35:35

Comparing candidate commit 87b59eb in PR branch nicole-cybul/llmobs-centralize-session-injection with baseline commit 1abef82 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2322 metrics, 36 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 [-209.690ms; +214.831ms] or [-7.908%; +8.102%]

scenario:appsec-appsec-enabled-26

unstable execution_time [-237.845ms; +234.699ms] or [-9.285%; +9.162%]

scenario:appsec-appsec-enabled-with-attacks-24

unstable execution_time [-159.857ms; +156.603ms] or [-5.188%; +5.083%]

scenario:appsec-appsec-enabled-with-attacks-26

unstable execution_time [-189.186ms; +201.169ms] or [-6.502%; +6.914%]

scenario:appsec-control-20

unstable execution_time [-107.363ms; +127.403ms] or [-6.520%; +7.737%]

scenario:appsec-control-24

unstable execution_time [-120.328ms; +124.355ms] or [-9.714%; +10.039%]

scenario:appsec-control-26

unstable execution_time [-124.641ms; +121.529ms] or [-10.058%; +9.807%]

scenario:appsec-iast-no-vulnerability-control-20

unstable execution_time [-15865.672µs; +15295.472µs] or [-6.222%; +5.999%]

scenario:appsec-iast-no-vulnerability-iast-enabled-always-active-20

unstable execution_time [-11.092ms; +25.205ms] or [-4.308%; +9.790%]

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

unstable execution_time [-12.027ms; +14.895ms] or [-4.700%; +5.820%]

scenario:appsec-iast-with-vulnerability-control-20

unstable execution_time [-26.567ms; +33.849ms] or [-4.875%; +6.211%]

scenario:debugger-line-probe-with-snapshot-default-26

unstable cpu_user_time [-4413.728ms; +4419.055ms] or [-37.153%; +37.198%]
unstable execution_time [-4396.634ms; +4390.573ms] or [-34.706%; +34.658%]
unstable instructions [-39499.2M instructions; +39565.4M instructions] or [-39.422%; +39.488%]
unstable max_rss_usage [-15508.219KB; +14178.619KB] or [-9.316%; +8.517%]
unstable throughput [-868.850op/s; +832.216op/s] or [-31.489%; +30.161%]

scenario:debugger-line-probe-with-snapshot-minimal-26

unstable cpu_user_time [-2239.948ms; +740.878ms] or [-23.499%; +7.772%]
unstable execution_time [-2263.858ms; +754.288ms] or [-22.068%; +7.353%]
unstable instructions [-20.2G instructions; +6.7G instructions] or [-25.351%; +8.392%]
unstable throughput [-153.600op/s; +447.141op/s] or [-4.757%; +13.847%]

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

unstable cpu_user_time [-3620.956ms; +3634.885ms] or [-35.099%; +35.234%]
unstable execution_time [-3616.468ms; +3622.982ms] or [-32.694%; +32.753%]
unstable instructions [-32245.9M instructions; +32252.8M instructions] or [-37.294%; +37.302%]
unstable max_rss_usage [-11291.070KB; +10549.470KB] or [-6.937%; +6.481%]
unstable throughput [-707.853op/s; +711.171op/s] or [-23.087%; +23.196%]

scenario:dogstatsd-with-tags-20

unstable cpu_user_time [-473.204ms; +242.911ms] or [-9.646%; +4.952%]
unstable execution_time [-470.322ms; +247.468ms] or [-9.439%; +4.967%]
unstable throughput [-87059.139op/s; +169336.724op/s] or [-5.167%; +10.050%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-20

unstable cpu_user_time [-3691.800µs; +3115.906µs] or [-5.586%; +4.714%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-24

unstable cpu_usage_percentage [-4.834%; +6.439%]

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

unstable max_rss_usage [-18.333MB; +33.101MB] or [-4.858%; +8.772%]

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

unstable max_rss_usage [-5.189MB; +8.130MB] or [-4.107%; +6.436%]

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

unstable cpu_user_time [-707.194ms; +704.337ms] or [-5.509%; +5.487%]
unstable execution_time [-703.868ms; +713.384ms] or [-5.366%; +5.439%]
unstable throughput [-3.271op/s; +3.220op/s] or [-5.331%; +5.248%]

scenario:test-optimization-large-suite-20

unstable max_rss_usage [-3084.485KB; +4826.151KB] or [-3.942%; +6.168%]

codecov · 2026-07-14T21:20:21Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.65%. Comparing base (1abef82) to head (87b59eb).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #9353    +/-   ##
========================================
  Coverage   96.64%   96.65%            
========================================
  Files         923      923            
  Lines      122844   122959   +115     
  Branches    20989    21055    +66     
========================================
+ Hits       118723   118843   +120     
+ Misses       4121     4116     -5

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Yun-Kim

small docstring suggestion but lgtm otherwise

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

…ction (#9353) * refactor(llmobs): centralize session_id injection in handleLLMObsInjection Session_id was propagated via a separate path from the other LLMObs propagated values (parent_id, ml_app): it was stored on _trace.tags as a `_dd.p.*` tag and injected implicitly by the standard propagator, while the others are injected explicitly in handleLLMObsInjection. Per review feedback, handle all of them in one place. The in-process trace-level default now lives under an internal, non-`_dd.p.` key (_ml_obs.trace_session_id) for sibling inheritance only, and handleLLMObsInjection emits `_dd.p.llmobs_sid` alongside parent_id/ml_app. Session is now handled the same way as ml_app rather than as a standard-propagator special case. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]> * docs(llmobs): mention session id in handleLLMObsInjection docstring Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]> --------- Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>

ncybul added the semver-patch label Jul 14, 2026

ncybul requested a review from a team as a code owner July 14, 2026 21:00

ncybul force-pushed the nicole-cybul/llmobs-centralize-session-injection branch from e1dc73a to 3ed7f1c Compare July 14, 2026 21:03

Yun-Kim reviewed Jul 14, 2026

View reviewed changes

Comment thread packages/dd-trace/src/llmobs/index.js Outdated

Yun-Kim previously approved these changes Jul 14, 2026

View reviewed changes

docs(llmobs): mention session id in handleLLMObsInjection docstring

87b59eb

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

ncybul dismissed Yun-Kim’s stale review via 87b59eb July 15, 2026 14:21

ncybul requested a review from Yun-Kim July 15, 2026 17:59

Yun-Kim approved these changes Jul 15, 2026

View reviewed changes

ncybul merged commit c0d2787 into master Jul 15, 2026
657 checks passed

ncybul deleted the nicole-cybul/llmobs-centralize-session-injection branch July 15, 2026 20:26

dd-octo-sts Bot mentioned this pull request Jul 16, 2026

v6.4.0 proposal #9368

Merged

dd-octo-sts Bot mentioned this pull request Jul 16, 2026

v5.115.0 proposal #9369

Merged

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pr-commenter Bot commented Jul 14, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Benchmarks

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More details about the CI and significant changes

Unstable benchmarks

scenario:appsec-appsec-enabled-24

scenario:appsec-appsec-enabled-26

scenario:appsec-appsec-enabled-with-attacks-24

scenario:appsec-appsec-enabled-with-attacks-26

scenario:appsec-control-20

scenario:appsec-control-24

scenario:appsec-control-26

scenario:appsec-iast-no-vulnerability-control-20

scenario:appsec-iast-no-vulnerability-iast-enabled-always-active-20

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

scenario:appsec-iast-with-vulnerability-control-20

scenario:debugger-line-probe-with-snapshot-default-26

scenario:debugger-line-probe-with-snapshot-minimal-26

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

scenario:dogstatsd-with-tags-20

scenario:plugin-claude-agent-sdk-compact-stream-scan-20

scenario:plugin-claude-agent-sdk-compact-stream-scan-24

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

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

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

scenario:test-optimization-large-suite-20

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codecov Bot commented Jul 14, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Codecov Report

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2 participants

ncybul commented Jul 14, 2026 •

edited

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dd-octo-sts Bot commented Jul 14, 2026 •

edited

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datadog-datadog-us1-prod Bot commented Jul 14, 2026 •

edited by datadog-prod-us1-3 Bot

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pr-commenter Bot commented Jul 14, 2026 •

edited

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codecov Bot commented Jul 14, 2026 •

edited

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