From https://alerts.wikimedia.org/?q=%40state%3Dactive&q=team%3Dwmcs:
Icinga/puppet last run 1 summary: WARNING: Puppet has 1 failures. Last run 28 minutes ago with 1 failures. Failed resources (up to 3 shown): Package[prometheus-openstack-exporter] 7 hours ago instance: cloudcontrol1005 team: wmcs @cluster: wikimedia.org
It seems to be failing to get the package:
root@cloudcontrol1005:~# apt install prometheus-openstack-exporter Reading package lists... Done Building dependency tree... Done Reading state information... Done Package prometheus-openstack-exporter is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'prometheus-openstack-exporter' has no installation candidate
Probably a side-effect of the bullseye upgrade, looking.