
328 vFoglight
Administration and Configuration Guide
About Data Management in vFoglight
vFoglight models retain collected data and transform it into nodes, adding configuration
data to each node as properties, and attaching metric data to appropriate nodes as
metrics. Each metric is associated with a topology type or with a specific topology
object. In some cases you will need to create custom topology types that suit your
monitoring needs. For more information, see “Adding Topology Types” on page 329.
There are two types of metrics in vFoglight:
• Raw metrics. They include the metrics collected directly from monitored hosts.
• Derived metrics. They are calculated from one or more raw or derived metrics.
Derived metrics are scoped to a topology type or its objects. You can create and
manage derived metrics using the Administration module. Derived metrics are
useful in situations when you need to reuse metric expressions in rules. For more
information on how to manage and create derived metrics, see “Working with
Derived Metrics” on page 332.
In vFoglight, retention policies allow you to define time periods where monitoring data
can be sampled, aggregated, or purged from your system. Topology objects inherit
retention policies from its topology type. vFoglight allows you to alter retention policies
for one or more topology types as required. For more information, see “Managing
Retention Policies” on page 372.
In addition to adding derived metrics and topology types, and altering the retention
policy for a topology type, vFoglight allows you to assign threshold levels to metrics.
This feature is useful in case you need to reference these levels in rules or derived
metrics. For more information on how to create and manage thresholds, see “Working
with Thresholds” on page 353.
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