> #### Adding log file rules

> You can include one or more rules and/or rule sets in a log file monitor. When you add a rule, you must also select search criteria and then associate it with severity and alert information to fully define the rule.

> ##### Log file monitor rule components

> A log file monitor rule consists of the following components:

> - Search criteria — The core element of log file rules. A search criterion allows you to create and store exactly what data a log file resource monitor will look for when it searches a log file. Fathom- and user-defined search criteria are stored in the library so they can be shared and reused in various log file monitor rules.
> See the "Specifying search criteria" section for details about the search criteria.

> - Severity — One of the four standard, user-selected severity levels: Information, Warning, Error, or Severe. This information is stored in the Severity field.
> - Alert — Identifies which action Fathom performs when an alert occurs. This user-selected information is stored in the On Alert Perform Action field.

> You can include a rule in the log file resource monitor in three ways:

> - By adding it to a single log file resource under the resource's monitoring plan, in which case the rule definition cannot be shared by other log file resource monitors.
> - By adding it to one or more rule sets, in which case the rule can be shared among several log file resource monitors.
> Note: Edits to any user-defined search criteria immediately affect all current instances in which the search criteria is used in individual rules or rule sets, and will also be used in instances to be created in the future. You can edit or delete Fathom-supplied search criteria.

> - Associating it with a log file resource monitor. An identical rule definition, defined in a rule set, can also be applied to this same log file resource monitor. In this situation, the individual, or locally defined rule, takes precedence. The rule definition associated with the rule set will be listed as part of the rule set, but the status icon for this duplicate rule will be gray and the status listed as Inactive.

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