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Feature flags are used as a way to easily toggle configuration
**at build time**. They are provided to accommodate feature deprecation and
downstream configuration changes.

Currently used upstream values for feature flags are set in
``cloudinit/features.py``. Overrides to these values should be
patched directly (e.g., via quilt patch) by downstreams.

Each flag should include a short comment regarding the reason for
the flag and intended lifetime.

Tests are required for new feature flags, and tests must verify
all valid states of a flag, not just the default state.
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