Health Monitor MIB module.

The Health Monitor uses a model based on events of varying 
severity and frequency, and predefined rules, to generate 
a metric that represents a system's (and its subsystems') 
level of health.   

The events are typically internally generated notifications
in response to detrimental or correctional changes in the 
state of the hardware or software of the system. Detrimental
events are classified under one of the following severity 
levels:

Catastrophic   - Causes or leads to system failure
Critical       - Major subsystem or functionality failure
High           - Potential for major impact to important 
                 functions
Medium         - Potential for minor impact to functionality
Low            - Negligible impact to functionality

Whilst correctional events fall under the following 
classification:

Positive       - Not a fault event. May cause or lead to 
                 the return of functionality

This MIB module provides information for tracking occurrences
of the above events, and presents the associated health 
metric for the system and its component subsystems.