That's a bludit (https://bludit.com) plugin will display a message to warn your visitors, that the post could be outdated.
Home Page: https://www.meagainsttheweb.de/bludit-plugin-warning-for-old-posts
License: MIT License
This is a bludit plugin. The plugins show a notification before or after your post, pointing out that the post could be outdated.
You can customize the plugin in the bludit admin area and change the time, after which the post is declared as old, the template, the position or the message itself.
Translation for English, German and French available.
Checkout this, my website, and that, official bludit plugin store.
See LICENSE for LICENSE.
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