Distinguishing instance state changes from propagated states

PATROL has two ways an application instance can achieve the WARN or ALARM state as follows:

• A PSL change_state
• An inherited parameter state

The WARN and ALARM state can be detected by analyzing the "status" and "ruleState" variables in the agent symbol table. This is possible through a PSL script, but is also possible through external SNMP access to the PATROL MIB.

The OFFLINE state can only occur due to a PSL change_state, and cannot be inherited from parameter states.

The "status" and "ruleState" variables are built-in variables in the instance's symbol table. The following table lists those situations that apply: