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Python: improve .env handling and observability samples (#4032)

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* Python: improve .env precedence and observability samples

- Switch load_settings to explicit precedence: overrides -> explicit .env -> environment -> defaults\n- Raise when env_file_path is provided but missing\n- Update settings docs and tests for new behavior\n- Refresh observability samples and README guidance for env loading options\n\nCloses #3864\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fixed some imports

* Fix load_settings CI regressions

Allow explicit env_file_path values that exist but are not regular files (for example /dev/null) by checking path existence before dotenv parsing, and restore a dict accumulator with typed return cast to satisfy mypy.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Avoid implicit dotenv in observability

Only load dotenv in observability helpers when env_file_path is explicitly provided, and remove test os.devnull workarounds that are no longer necessary.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Eduard van Valkenburg
2026-02-18 12:18:52 +01:00
committed by GitHub
Unverified
parent f900febb6f
commit 534e5f5bf7
41 changed files with 250 additions and 221 deletions
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python/packages/core/tests/conftest.py
+1 -1
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@@ -61,7 +61,7 @@ def span_exporter(monkeypatch, enable_instrumentation: bool, enable_sensitive_da
importlib.reload(observability)
# recreate observability settings with values from above and no file.
observability_settings = observability.ObservabilitySettings(env_file_path="test.env")
observability_settings = observability.ObservabilitySettings()
# Configure providers manually without calling _configure() to avoid OTLP imports
if enable_instrumentation or enable_sensitive_data: