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---
upgrade:
- |
Positional options are now required by default, to match argparse's default
behavior. To revert this behavior (and maintain optional positional
arguments), you need to explicitly specify ``positional=True,
required=False`` as part of the options definition.
fixes:
- |
On the command line, oslo.config now returns command usage information from
argparse (instead of dumping a backtrace) when required arguments are
missing.
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