[SVLS-5649] Add HTTP Context Propagation to Azure Functions

[jcstorms1]

What does this PR do?

Updates the current Azure Function plugin to include HTTP context propagation.

Motivation

In order to provide customers with a complete distributed trace, HTTP triggered functions need to propagate trace context correctly. Previously HTTP triggered functions were not parenting correctly due to the lack of context propagation.

Plugin Checklist

• Unit tests.
• Integration tests.
• Benchmarks.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CI jobs/workflows.

Additional Notes

[github-actions]

Overall package size

Self size: 9.64 MB
Deduped: 104.59 MB
No deduping: 105.11 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.6.0 | 30.47 MB | 30.47 MB | | @datadog/native-appsec | 8.5.2 | 19.33 MB | 19.34 MB | | @datadog/pprof | 5.8.0 | 12.55 MB | 12.92 MB | | @datadog/native-iast-taint-tracking | 4.0.0 | 11.72 MB | 11.73 MB | | @opentelemetry/core | 1.30.1 | 908.66 kB | 7.16 MB | | protobufjs | 7.5.3 | 2.95 MB | 5.6 MB | | @datadog/wasm-js-rewriter | 4.0.1 | 2.85 MB | 3.58 MB | | @datadog/native-metrics | 3.1.1 | 1.02 MB | 1.43 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.14.0 | 120.58 kB | 841.68 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.1 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | istanbul-lib-coverage | 3.2.2 | 34.37 kB | 34.37 kB | | rfdc | 1.4.1 | 27.15 kB | 27.15 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | dc-polyfill | 0.1.9 | 25.11 kB | 25.11 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | shell-quote | 1.8.2 | 23.54 kB | 23.54 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | mutexify | 1.4.0 | 5.71 kB | 8.74 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.4 | 3.96 kB | 3.96 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.79%. Comparing base (8045409) to head (c1acf5e).
Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5839      +/-   ##
==========================================
- Coverage   80.65%   79.79%   -0.87%     
==========================================
  Files         463      421      -42     
  Lines       19841    18763    -1078     
==========================================
- Hits        16002    14971    -1031     
+ Misses       3839     3792      -47     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-10 21:54:07

Comparing candidate commit c1acf5e in PR branch storms/add-azure-function-http-propagation with baseline commit 8045409 in branch master.

Found 0 performance improvements and 2 performance regressions! Performance is the same for 1274 metrics, 47 unstable metrics.

scenario:plugin-bluebird-control-22

• 🟥 cpu_user_time [+6.370ms; +10.179ms] or [+5.634%; +9.003%]
• 🟥 execution_time [+7.644ms; +10.791ms] or [+5.439%; +7.678%]

[datadog-datadog-prod-us1]

Datadog Report

Branch report: storms/add-azure-function-http-propagation
Commit report: cd308c5
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 1086 Passed, 0 Skipped, 18m 9.94s Total Time

[BridgeAR]

Could you please add a test for this? :)

[rochdev]

Should this be a semver-patch? I think this was probably always expected to have worked.