Monitor backup software
velero serves prometheus metrics by default. The helm chart has a toggle for creating a ServiceMonitor, which is not enabled by default. We should enable that, and probably add alerts for failed backups.
See also https://github.com/vmware-tanzu/velero/issues/2725 .
Unfortunately the metrics don't seem to include backups with warnings, which you get for example when a volume name specified by the velero annotation on the pod doesn't match any of the pod volumes.