Document Metrics capability and include notes about using with Metrics 4.0+

Description

The metrics section of our documentation is currently empty. We should provide some basic information about the metrics and how to utilize them.

In addition, wIth metrics 4.0, the JMX capability was moved to a separate module, metrics-jmx. We should add a FAQ entry describing how to disable JMX reporting so 4.0 reporting works and also instructions for adding metrics-jmx and enabling JMX reporting manually.

Environment

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Assignee

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Reporter

Andy Tolbert

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