In Bitbucket Server 7.11, the product's dashboard page was overhauled and the existing internal client web section bitbucket.internal.dashboard.pull-request.table-column.after on that page was removed.

Although this API was purely internal, some third party applications were using it.
See this Developer Community question.

To allow third party developers to add additional columns to the dashboard's pull request tables, Bitbucket Server could introduce a Client-side Extension point, similar to the pull request's page commits table. This would provide a public API for this use-case.