Explanation/Reference:
Conventional tools tend to focus and produce metrics on individual resources which is inadequate for an agile shared services computing environment.
Note:
A metric is a unit of measurement used to report the health of the system that is captured from the monitored infrastructure components. Metrics from all monitored infrastructure components are stored and aggregated in the Management Repository, providing administrators with a rich source of diagnostic information and trend analysis data.
Reference: Oracle Reference Architecture, Management and Monitoring, Release 3.0