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---
deprecations:
- |
The ``[scheduler] driver`` config option has been deprecated. This was
previously used to switch between different scheduler drivers including
custom, out-of-tree ones. However, only the ``FilterScheduler`` has been
supported in-tree since 19.0.0 (Stein) and nova increasingly relies on
placement for basic functionality, meaning developing and maintaining
out-of-tree drivers is increasingly difficult. Users who still rely on a
custom scheduler driver should migrate to the filter scheduler, using
custom filters and weighters where necessary.
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