Deprecation: Ohai::Config removal (OHAI-1)
Ohai 8.8.0 (Chef Client 12.6.0) introduced a new Ohai configuration system as defined in RFC-053. This system replaced the existing usage of Ohai::Config config system, which will be removed in Chef Client 13.
Remediation
Previous Ohai configuration values in the client.rb file need to be updated for the new configuration system format. For example, to configure the plugin_path value previously you would set Ohai::Config[:plugin_path] = "/etc/chef/ohai/plugins.local", where as you would now use ohai.plugin_path = "/etc/chef/ohai/plugins.local". See the Ohai Configuration Documentation for additional usage information.
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https://docs.chef.io/deprecations_ohai_legacy_config/