It appears likely that grafana1001.eqiad.wmnet is missing some firewall rules somewhere (I am yet to figure out where) that make it able to talk to pay-lvs1001.frack.eqiad.wmnet and pay-lvs2001.frack.eqiad.wmnet.
These are datasources used in a few consoles e.g. https://grafana.wikimedia.org/d/000000403/fundraising-database?orgId=1 which are now broken.
@cwdent indicated that it's preferred to not make firewall changes while the fundraiser is running, so instead, for the interim, I will set up a new endpoint https://grafana-old.wikimedia.org/ and then take it down once this issue is fixed properly.