fix(internal): do not mutate actual config for flare emission

[KowalskiThomas]

Description

This fixes a bug where the live tracer configuration was mutated when redacting the API key before writing the flare diagnostic file. This meant that any subsequent use of the API key in the configuration file would not work (since the API key was broken).

[cit-pr-commenter-54b7da]

Codeowners resolved as

ddtrace/internal/flare/flare.py                                         @DataDog/apm-core-python
tests/internal/test_tracer_flare.py                                     @DataDog/apm-core-python

[datadog-official]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 4 Pipeline jobs failed

System Tests | tracer-release / End-to-end #4 / flask-poc 4     

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Healthcheck failed for weblog: curl: (28) Operation timed out after 2002 milliseconds with 0 bytes received. Worker process timed out, leading to exit code 1.

System Tests | tracer-release / End-to-end #4 / uds-flask 4     

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Worker timeout in container weblog after multiple retries. Could not reach service: connection timed out.

System Tests | tracer-release / End-to-end #6 / django-poc 6     

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Healthcheck failed for weblog: curl: (28) Operation timed out after 2002 milliseconds with 0 bytes received.

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ℹ️ Info

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🧪 All tests passed
❄️ No new flaky tests detected

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-05-20 15:41:43

Comparing candidate commit b5aeda5 in PR branch kowalski/fix-internal-do-not-mutate-actual-config-for-flare-emission with baseline commit a6282d1 in branch main.

Found 0 performance improvements and 3 performance regressions! Performance is the same for 371 metrics, 9 unstable metrics.

scenario:httppropagationinject-ids_only

• 🟥 execution_time [+1.681µs; +1.870µs] or [+8.283%; +9.214%]

scenario:span-start

• 🟥 execution_time [+1.541ms; +1.670ms] or [+9.982%; +10.818%]

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

• 🟥 execution_time [+248.988ns; +283.316ns] or [+12.016%; +13.673%]

[brettlangdon]

regression test?

[KowalskiThomas]

@brettlangdon added a regression test, thanks for suggesting.