This is a clone of issue RHEL-101724 to use for version rhel-9.7
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Original description:
There are plenty of PCP PMDAs (agents) that could be enabled in various scenarios with the metrics role, for instance the Podman PMDA would be very helpful when many or most relevant components are running as containers.

Currently, the metrics role does not allow passing through the pcp_optional_agents variable but only includes there the agents enabled with role options like metrics_from_postfix.

Instead of adding a separate metric variable for every relevant or new PCP PMDA it would be helpful to allow defining a list of PMDAs the role should enable. Thanks.