Dell OpenManage Network Manager Client Manual page 249

To reduce resource impacts, the
scope of retained data may
exclude some of the collected
data. A monitor may have no
retained data and only emit
events based on transient results
in the execution/calculation.
For example, the application
can derive a metric from several
collected values and you may
opt to retain only the derived result.
All monitors rely on a polling engine which provides runtime mediation activities for distributed
device interaction at regular intervals. Monitors may share a retention policy. Data is rolled up
hourly and daily into summary data. The retention policy controls how long data is held per roll-up
period.
When you manage these policies, you configure how monitored data is retained. When you select
Manage Retention Policies in the Monitors portlet, first a list of available policies appears.
Clicking the Add button at the top of the screen lets you create a new policy, while clicking the Edit
button to the right of selected, listed policies lets you modify existing policies. The Delete button
to the right of listed policies removes them from the list.
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Resource Monitors | Monitoring