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30 vFoglight

Getting Started Guide

Traditional monitoring systems collect metrics from agents and present them to you.

The context for these metrics (for example, host from which data is collected or the

name of the database) is gathered at the same time as the metrics and is associated with

them. This is an expensive way to store information: context tends to remain static over

time, but there are often multiple metrics for a single context. In addition, when you

store context this way, it makes it difficult to determine when the context changes—

which in itself may be something you are interested in monitoring. Traditional systems

also do not allow you to correlate metrics from different nodes in a system, or to derive

cluster data from individual server data.

vFoglight monitoring uses a different approach. vFoglight builds model instances from

collected data. A model instance is a set of objects and relationships designed to

represent a monitored resource and its parts. Each model instance is a representation of

vFoglight Agent

Manager

A component that manages agents installed on monitored hosts.

See “vFoglight Agent Manager” on page 37 for more

information.

Cartridge A unit that is added to the vFoglight Management Server.

Cartridges contain components that extend the functionality of

vFoglight, such as agents, rules, and views. See “Cartridges” on

page 37 for more information.

Agent A vFoglight component that monitors a specific part of your

environment, such as an operating system, application, or

server.

Agents collect data from your monitored environment and send

it to the Management Server. See “Agents” on page 38 for more

information.

Rule A piece of business logic that links a condition with a result.

vFoglight evaluates rule conditions against monitoring data. If a

condition evaluates to true, the results that are configured for

that condition occur, for example, an alarm is fired and an email

is sent.

Registry Variable A variable stored in the vFoglight registry that can be used in

rule conditions, actions, and expressions. The value of a

vFoglight registry variable can be configured to change over

time.

Term Definition

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