Metrics not available for cert-manager operator

Issue

After enabling monitoring for the cert-manager operator, the metrics are not visible under Observe > Metrics:
certmanager-* metrics not available Observe > Metrics.

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Here are the common uses of Markdown.

Code blocks

~~~
Code surrounded in tildes is easier to read
~~~

Links/URLs

[Red Hat Customer Portal](https://access.redhat.com)