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We have been working on making more Tempest module stable, especially for
Tempest plugins.
Once this work is complete, plugins will benefit from backward
compatibility on an extended set
of Tempest API.

This benefit comes at a small cost though, since we have to make a few
changes to the modules
before they can be declared as stable. In some cases the impact will be
zero, in other cases it
should be limited to changing an import line or adding an __init__
parameter, but I wanted to give
ample warning to everyone that the changes are coming, so that people can
prepare.

Some more details about this work and the specific patches on Tempest side
is available at [0].

Below is a list of the modules affected and main changes that will be
coming in the near future.
The list of modules affected

The following module will be marked as stable, and moved under tempest.lib:
- tempest/services/object_storage: there may be changes to the interface
- tempest/common/dynamic_creds: extra __init__ parameters will be required
- tempest/common/preprov_creds: extra __init__ parameters will be required
- tempest/common/fixed_network

The following modules will be marked stable for plugins:
- tempest/test.py: No change planned
- tempest/clients.py: Client aliases will only be defined when the
corresponding service is marked
  as enabled in config
- tempest/common/credentials_factory: signature changes to a couple of
helpers

Andrea Frittoli (andreaf)

[0] https://etherpad.openstack.org/p/tempest-test-module-stable
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