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*This file holds "in progress" release notes for the current release under development and is intended for consumption by the Chef Documentation team.
Please see [https://docs.chef.io/release_notes.html](https://docs.chef.io/release_notes.html) for the official Chef release notes.*
# Chef Client Release Notes 12.16:
## Highlighted enhancements for this release:
* Added `attribute_changed` event hook:
In a cookbook library file, you can add this in order to print out all attribute changes in cookbooks:
```ruby
Chef.event_handler do
on :attribute_changed do |precedence, key, value|
puts "setting attribute #{precedence}#{key.map {|n| "[\"#{n}\"]" }.join} = #{value}"
end
end
```
If you want to setup a policy that override attributes should never be used:
```ruby
Chef.event_handler do
on :attribute_changed do |precedence, key, value|
raise "override policy violation" if precedence == :override
end
end
```
There will likely be some missed attribute changes and some bugs that need fixing (hint: PRs accepted), there could be
added command line options to print out all attribute changes or filter them (hint: PRs accepted), or to add source
file and line numbers to the event (hint: PRs accepted).
## Highlighted bug fixes for this release:
|
