500,000 errors in last 2 hrs
https://logstash.wikimedia.org/app/dashboards#/doc/logstash-*/logstash-default-1-7.0.0-1-2024.01.30?id=z6kxW40Bk70gu8Gmb2AK
https://logstash.wikimedia.org/app/dashboards#/view/AXDBY8Qhh3Uj6x1zCF56?_g=h@c45c1a7&_a=h@3910f78
This seems to correspond with this backport:
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Popups/+/994028