GitHub user uce opened a pull request:
https://github.com/apache/flink/pull/4553
[FLINK-7642] [docs] Add very obvious warning about outdated docs
## What is the purpose of the change
This pull requests make the warning about outdated docs more obvious.

Please compare the screenshot to our current state:
https://ci.apache.org/projects/flink/flink-docs-release-1.1/
If you like this, I would back/forward port this to all versions >= 1.0 and
update the releasing Wiki page to add a note about updating the configuration
of the docs.
## Brief change log
- Change the color of the outdated warning footer to red
- Rename the config key from `is_latest` to `show_outdated_warning`
- Add an outdated warning to every page before the actual content
## Verifying this change
- We don't have any tests for the docs
- You can manually check out my branch and build the docs
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uce/flink 7462-outdated_docs_warning
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/4553.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #4553
----
commit e140634687a56fb5fdd0e32a1dce3d5ac41fd123
Author: Ufuk Celebi <[email protected]>
Date: 2017-08-16T16:21:49Z
[FLINK-7462] [docs] Make outdated docs footer background light red
commit 15fe71e0402d2e2d931485497338973e12cce9db
Author: Ufuk Celebi <[email protected]>
Date: 2017-08-16T16:34:51Z
[FLINK-7462] [docs] Rename is_latest flag to show_outdated_warning
commit 9bdeeae0cb88b59f0dfaee547fbf9b54d125645e
Author: Ufuk Celebi <[email protected]>
Date: 2017-08-16T16:35:03Z
[FLINK-7462] [docs] Add outdated warning to content
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