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Ansible: TRANSFORM_INVALID_GROUP_CHARS deprecation warning

After upgrading Ansible to version 2.8.3, the following deprecation warning appeared many times:

[DEPRECATION WARNING]: The TRANSFORM_INVALID_GROUP_CHARS settings is set to allow bad characters in group names by default, this will change, but still be user configurable on deprecation. This feature will be removed in version 2.10. Deprecation warnings can be 
disabled by setting deprecation_warnings=False in ansible.cfg.
 [WARNING]: Invalid characters were found in group names but not replaced, use -vvvv to see details

Wow, previously valid names in my hosts.cfg file are soon invalid? What's going on here?

 

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