fix(tracing): missing svc_src:m case

[emmettbutler]

provide fallback svc_src for the case where root spans are not given service names on creation and later have service name overridden.

[datadog-dd-trace-py-rkomorn]

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[datadog-datadog-prod-us1-2]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 12 Pipeline jobs failed

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DataDog/apm-reliability/dd-trace-py | build linux serverless: [amd64, cp315-cp315, v113741238-d2b8243-manylinux2014_x86_64, 1]     

DataDog/apm-reliability/dd-trace-py | build linux serverless: [amd64, cp315-cp315, v113741491-d2b8243-musllinux_1_2_x86_64, 1]     

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ℹ️ Info

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🧪 All tests passed
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[chatgpt-codex-connector]

Update snapshots for the new svc_src tag

When this fallback is hit for integrations that set a configured service after creating the span, it now adds meta._dd.svc_src: m to payloads, but the commit does not update the affected snapshots. For example, tests/contrib/graphql/test_graphql.py::test_span_schematization with DD_SERVICE=my-service and Kafka's test_service_override_config both exercise this path and their checked-in snapshots currently omit _dd.svc_src, so snapshot CI will fail unless those expected files are updated or the tag is intentionally ignored.

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-06-22 20:56:32

Comparing candidate commit 07056b7 in PR branch emmett.butler/extra-m with baseline commit 7bc2d63 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 68 metrics, 0 unstable metrics.

[cit-pr-commenter-54b7da]

Codeowners resolved as

tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_error.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_multiple_messages.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_stream.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_stream_error.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_stream_tool.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_system_prompt.json  @DataDog/ml-observability
tests/snapshots/tests.contrib.vertexai.test_vertexai.test_vertexai_completion_tool.json  @DataDog/ml-observability