yaml callback plugin deprecation warning about DefaultCallback in v2.10

[ktdreyer]

SUMMARY

The yaml callback plugin prints a deprecation warning about DefaultCallback.

ISSUE TYPE

• Bug Report

COMPONENT NAME

yaml

ANSIBLE VERSION

ansible 2.10.0b1
  config file = /home/kdreyer/.ansible.cfg
  configured module search path = ['/home/kdreyer/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /tmp/top/venv/lib/python3.7/site-packages/ansible
  executable location = /tmp/top/venv/bin/ansible
  python version = 3.7.7 (default, Jun  4 2020, 15:43:14) [GCC 9.3.1 20200408 (Red Hat 9.3.1-2)]

CONFIGURATION

DEFAULT_STDOUT_CALLBACK(/home/kdreyer/.ansible.cfg) = yaml

OS / ENVIRONMENT

Fedora 31, testing 2.10.0 beta 1.

STEPS TO REPRODUCE

1. Install Ansible 2.10.0b1 from PyPI
2. Install the community.general collection to get the yaml callback plugin:
   ansible-galaxy collection install community.general
3. Ensure the yaml callback plugin is enabled in ~/.ansible.cfg, like so:

[defaults]
stdout_callback = yaml

EXPECTED RESULTS

Ansible runs with no deprecation warnings.

ACTUAL RESULTS

Ansible shows a deprecation warning:

'ansible_collections.community.general.plugins.callback.yaml' is subclassing DefaultCallback without the corresponding doc_fragment. This feature will be removed from ansible-base in version 2.14. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

[ansibullbot]

Files identified in the description:

• plugins/cache/yaml.py

If these files are inaccurate, please update the component name section of the description or use the !component bot command.

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[Akasurde]

resolved_by_pr ansible/ansible#70228