SCOM: Monitor vs. Rule

舉例 :
Rules :
如同街上的攝影機，記錄所有的狀況
發生問題時可以調閱紀錄
Monitors :
如同測速照相機
超過一定的速限則被照相

Rules
========
Rules Collect data from sources like EventLog, Text or Log Files and Perfmon. That data is stored
In the Operations Manager database. If you have installed a Data Warehouse database this data is replicated to this database for Reporting purposes.
Rules always target classes. You should not target rules to groups. See the Authoring Guide from Microsoft for best practices. Targeting groups results in targeting the Root Management Server, as this is the host of all groups.

Monitors
============
Monitors are used to determine the health state of an application component. A monitor is programmed with the intelligence to determine whether a component is healthy.

Monitors exist in two flavours, Two-state and Tree-State. Thus, a monitor can either be in one of two states (green or red) or in one of three states (green, yellow, red).
The state changes when the monitor responses to the monitoring information the monitor is using.

Monitors come in three different types: Unit Monitor, Aggregate Rollup Monitor and Dependency Rollup Monitor