feat(profiling): add fast-copy fallback ProfilerStats metrics [backport 4.11] (PROF-15342)

[vlad-scherbich]

Summary

Cherry-pick of d6ee9b5 onto 4.11 (after #18972). Adds fast_copy_memory_user_disabled, fast_copy_memory_capable, and fast_copy_memory_syscall_fallback ProfilerStats metadata fields.

Test plan

• CI green on 4.11 profiling suites
• Cherry-pick applied; sampler.cpp conflict resolved (kept ephemeral count + new metrics)

[datadog-official]

 

⚠️ Warnings

🚦 10 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-py | build linux serverless: [arm64, cp315-cp315, v113741357-d2b8243-manylinux2014_aarch64, 1]     

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

DataDog/apm-reliability/dd-trace-py | build linux: [arm64, cp315-cp315, v113741589-d2b8243-musllinux_1_2_aarch64]     

View all 10 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

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[chatgpt-codex-connector]

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-07-10 21:38:09

Comparing candidate commit f573264 in PR branch backport-metrics-to-4.11 with baseline commit 0b6e17b in branch 4.11.

Found 0 performance improvements and 5 performance regressions! Performance is the same for 612 metrics, 10 unstable metrics.

scenario:iast_aspects-re_expand_aspect

• 🟥 execution_time [+276.832µs; +315.745µs] or [+7.790%; +8.885%]

scenario:iastaspects-ljust_aspect

• 🟥 execution_time [+87.044µs; +98.819µs] or [+14.326%; +16.265%]

scenario:iastaspectsospath-ospathbasename_aspect

• 🟥 execution_time [+89.558µs; +98.002µs] or [+21.082%; +23.069%]

scenario:span-start

• 🟥 execution_time [+1.359ms; +1.532ms] or [+8.693%; +9.804%]

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

• 🟥 execution_time [+196.948ns; +234.674ns] or [+9.111%; +10.857%]

[cit-pr-commenter-54b7da]

Codeowners resolved as

ddtrace/appsec/_iast/_iast_request_context_base.py                      @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/__init__.py                        @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/_taint_objects.py                  @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/_taint_objects_base.py             @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/taint_tracking/taint_range.cpp     @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/taint_tracking/taint_range.h       @DataDog/asm-python
releasenotes/notes/fix-iast-scope-copy-ranges-to-active-slot-a1b2c3d4e5f60789.yaml  @DataDog/apm-python
releasenotes/notes/iast-fix-crash-taint-query-without-context-b3d9f1c47a2e08d6.yaml  @DataDog/apm-python
tests/appsec/iast/taint_tracking/test_context.py                        @DataDog/asm-python