@startuml

package server1 {
	[vserverapp] .up.> horizon1 : 1
}
package server2 {
	horizon2 .down.> [vserverbd] : 4
}
blackhole -down-> horizon1 : 0
blackhole -down-> horizon2 : 0
blackhole .down.> horizon1 : 2
blackhole .down.> horizon2 : 3
@enduml