pager.go
func Trigger(description string) (incidentKey string, err error) {
	return trigger(description, "", map[string]interface{}{})
}
func Trigger(description string) (incidentKey string, err error) {
	return trigger(description, "", map[string]interface{}{})
}
// -- Trigger
// Trigger creates a new PagerDuty incident using the default client with the
// given description. The returned incident key can be used to resolve the
// incident. It can also be used by the "TriggerIncidentKey*" functions to
// trigger an incident only if that specific incident has been resolved.