shahar1 opened a new pull request, #66979:
URL: https://github.com/apache/airflow/pull/66979
## Summary
Enables ruff rule **B008** (`function-call-in-default-argument`) which
catches function calls used as default argument values — a common source of
bugs where mutable objects or config reads are shared across all calls instead
of being fresh per call.
- Adds `[tool.ruff.lint.flake8-bugbear] extend-immutable-calls` to exempt
FastAPI DI callables (`Depends`, `Query`, `Path`, `Body`, `Security`) and the
stateless `cryptography` SHA256 descriptor, which are intentionally used in
argument defaults
- Fixes **13 real violations** across core, task-sdk, shared libs, and
providers:
- **task-sdk `BaseSensorMixin`**: `conf.getfloat("sensors",
"default_timeout")` was read once at import time; now read at instantiation
- **task-sdk `Resources`**: `conf.getint(...)` for
`cpus`/`ram`/`disk`/`gpus` read at import time; now read at instantiation
- **providers/google `S3ToGCSOperator`**: `conf.getboolean("operators",
"default_deferrable")` read at import time
- **providers/google Vertex AI Ray hook and operator**:
`resources.Resources()` mutable default shared across all calls
- **shared/observability** (`SafeStatsdLogger`, `SafeDogStatsdLogger`,
`SafeOtelLogger`): `PatternAllowListValidator()` mutable instances shared
across all logger instances
- **openlineage system test**: `setup_jinja()` mutable Jinja `Environment`
shared across operator instances
- **api_fastapi `LimitFilter.depends`**: `conf.getint("api",
"fallback_page_limit")` in FastAPI dependency method moved to module-level
constant `_FALLBACK_PAGE_LIMIT`, preserving the OpenAPI schema default value
while making the intent explicit
- **providers/fab test conftest**: `types.SimpleNamespace(...)` mutable
default in context manager helper
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Sonnet 4.6 (claude-sonnet-4-6)
Generated-by: Claude Sonnet 4.6 (claude-sonnet-4-6) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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