Comment 4 for bug 1897967

I haven't checked the other rdeps but they are potentially broken. Those are the rdeps:

$ reverse-depends -b -r focal golang-github-prometheus-common-dev
Reverse-Build-Depends
* etcd
* gitlab-workhorse
* golang-github-prometheus-client-golang
* nomad
* prometheus
* prometheus-alertmanager
* prometheus-apache-exporter
* prometheus-bind-exporter
* prometheus-bird-exporter
* prometheus-blackbox-exporter
* prometheus-haproxy-exporter
* prometheus-ipmi-exporter
* prometheus-mysqld-exporter
* prometheus-nginx-vts-exporter
* prometheus-node-exporter
* prometheus-postgres-exporter
* prometheus-pushgateway
* prometheus-snmp-exporter
* prometheus-sql-exporter
* prometheus-squid-exporter

Prometheus itself already FTBFS in Focal but because of another issue:

https://bugs.launchpad.net/ubuntu/+source/prometheus/+bug/1878709