The current rate of capacity consumption seems to be around 10% / month since October 1. If this stays stable, we'll be below 10% of capacity before we are fully back from the end of year holiday. This seems to close to the limit to be comfortable.

https://gitlab.wikimedia.org/repos/data-engineering/airflow-dags/-/merge_requests/941 has been merged and should also reduce storage consumption (see T379024)

Would a split by "instance of" (P31) be useful?

Let's not touch this during December, it seems too risky. But we can already come up with a plan and probably a number of steps as subtasks.

Moving back to our backlog. Some specific cases are addressed in T378382, the rest will be revisited once we have made more progress.