This one is exactly the same request as https://www.drupal.org/node/197486.
Having an indicator on the modules list page would remove a duplicate interface that lists all modules, and be a more intuitive place for site builders to find available update information. Additionally, having the indicator in a place site builders visit all the time might also encourage updating more often, creating more secure sites for all.
GitHub Issue #:
502
Recent comments
I agree with BWPanda about the better way to add a filter. As for your general question on how to add an array to a config file (which gets stored as json), have you tried: $config = config('...
How to programmatically insert an array into config file
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How to programmatically insert an array into config file
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