The smart rule types by path segment, each mapped to the <eventType>
its alerts carry on the event stream.
FieldDetection and LineDetection post all-lowercase event types; the
rest keep their camel case. Every type but LineDetection is a region
rule that smartRules reads.
FieldDetection: string
LineDetection: string
regionEntrance: string
regionExiting: string
loitering: string
group: string
rapidMove: string
parking: string
unattendedBaggage: string
attendedBaggage: string