When trying to access https://query.wikidata.org/ , I am currently getting the directory listing rather than the expected GUI. Likewise, saved queries like this or that do not work.
@Lydia_Pintscher Thanks this is definitely related to that work. When I spot-checked query.wikidata.org after merging earlier it looks like the new config hadn't taken effect yet thus why things initially looked okay.
Reverted the puppet change. Working on getting things back how they should be currently.
(Thanks for opening this @Daniel_Mietchen)
Config change was successfully reverted. We had to clear out the varnish cache with echo 'https://query.wikidata.org/' | mwscript purgeList.php per https://wikitech.wikimedia.org/wiki/Kafka_HTTP_purging.
Everything should be / is back to normal now.