ci(py3.15): add 3.15 to riot matrix with gated suites

[vlad-scherbich]

prev: #17849 | next: #19252

Summary

Riotfile 3.15, docker testrunner, suite gating.

Test plan

• CI green on this branch
• Stack merges cleanly into the next PR's base branch

[datadog-datadog-prod-us1-2]

 

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⚠️ Warnings

🚦 4 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-py | check_requirements_lockfiles     

DataDog/apm-reliability/dd-trace-py | baseline:build     

DataDog/apm-reliability/dd-trace-py | build_base_venvs: [3.15]     

View all 4 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 2 jobs - 1 passed on retry

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-07-23 14:42:31

Comparing candidate commit 3897d97 in PR branch vlad/315-ci-matrix with baseline commit bd180ec in branch main.

Found 0 performance improvements and 5 performance regressions! Performance is the same for 616 metrics, 10 unstable metrics.

scenario:iastaspects-lstrip_aspect

• 🟥 execution_time [+59.028µs; +63.745µs] or [+18.571%; +20.054%]

scenario:iastaspects-translate_aspect

• 🟥 execution_time [+41.572µs; +49.328µs] or [+8.349%; +9.907%]

scenario:iastaspectsospath-ospathbasename_aspect

• 🟥 execution_time [+84.487µs; +92.627µs] or [+19.805%; +21.713%]

scenario:span-start

• 🟥 execution_time [+1.130ms; +1.300ms] or [+7.133%; +8.205%]

scenario:telemetryaddmetric-1-count-metric-1-times

• 🟥 execution_time [+186.191ns; +231.514ns] or [+8.672%; +10.782%]

[cit-pr-commenter-54b7da]

Codeowners resolved as

tests/internal/test_auto.py                                             @DataDog/apm-core-python
tests/internal/test_forksafe.py                                         @DataDog/apm-core-python
tests/internal/test_safety.py                                           @DataDog/apm-core-python

[cit-pr-commenter-54b7da]

Circular import analysis

⚠️ Existing circular imports

There are 33 circular imports that already exist on the base branch and have not been changed by this PR.

Show existing cycles (showing 5 of 33 shortest)

ddtrace.internal.datastreams -> ddtrace.internal.datastreams.kafka -> ddtrace.internal.datastreams
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.botocore -> ddtrace.internal.datastreams
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.kombu -> ddtrace.internal.datastreams
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.google_cloud_pubsub -> ddtrace.internal.datastreams
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.aiokafka -> ddtrace.internal.datastreams

To see all cycles, download the cycles-base.json and cycles-pr.json artifacts from this CI job and run:

uv run --script scripts/import-analysis/cycles.py compare cycles-base.json cycles-pr.json

[vlad-scherbich]

Superseded: the profiling stack (#19267–#19275, tip #19254) is rebased onto #19724 (vlad/ci-fix-smoke-tests-py315). This PR is no longer in the stack chain.