Question about irule event action in APM

The ID box should contain an unique (arbitrary) value. That value is assigned to the [ACCESS::policy agent_id] command when the policy reaches a specific iRule event agent in policy processing (you can have more than one iRule agent in your policy).

So then an iRule would use something like the following to trigger specific actions at different points in the access policy sequence:

when ACCESS_POLICY_AGENT_EVENT {
    switch [ACCESS::policy agent_id] {
        "EVENT1" {
             ... do something here at the EVENT1 stage
        }
        "EVENT2" {
             ... do something here at the EVENT2 stage
        }
    }
}

In this example, there are two iRule event agents in the VPE (presumably in different places), with IDs "EVENT1" and "EVENT2".