pager.go
func TriggerIncidentKey(description string, key string) (incidentKey string, err error) {
	return trigger(description, key, map[string]interface{}{})
}
func TriggerIncidentKey(description string, key string) (incidentKey string, err error) {
	return trigger(description, key, map[string]interface{}{})
}
// TriggerIncidentKey triggers an incident using the default client with a
// given incident key only if that incident has been resolved or if that
// incident doesn't exist yet.