prometheus query link broken in karma

in karma, when there's an alert, there's a link to the query that triggered it, in Prometheus. It looks like this:

The "default" link points to http://hetzner-nbg1-01:9090/graph?g0.expr=probe_success%7Bjob%3D%22blackbox_ssh_banner%22%7D+%3C+1&g0.tab=1

that should be https://prometheus1.torproject.org/graph?g0.expr=probe_success%7Bjob%3D%22blackbox_ssh_banner%22%7D+%3C+1&g0.tab=1 (note: https and real hostname)