In T269147 we reworked how Program and Organisation pages load data, using the new aggregates tables. This required removing the namespace filtering functionality. The old feature allowed users to input any integer, and filter results based on events with that namespace ID.

We should have a filtering option at the top of every Program and Organisation page which allows users to filter the results for just those events in the article namespace. Fully flexible filtering across all namespaces is not required - we're primarily interested in whether a link event took place in an article or not.