Hi Egon,
My bot produces a weekly federation report at
https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/Federation_report
The WikiPathways SPARQL endpoint URL has changed, and I have requested an update (Jan 2020, [0]), but no update or reply yet.
Maarten, that is causing the simple query in this report to fail.
I created https://phabricator.wikimedia.org/T249041 for this. The Wikimedia site requests is one of the more active boards in my experience. Let's see how it goes. If it goes well, we can just start moderating https://www.wikidata.org/wiki/Wikidata:SPARQL_federation_input and create a site request for everything that gets approved.
Maarten