@startuml
!include <material/radar>

left to right direction
skinparam defaultTextAlignment center

rectangle "<$ma_radar>\nQueue\nTracker" as block #DeepSkyBlue

interface " " as q1
interface " " as q2
interface " " as q3
interface " " as q4

q1 --> block: enter
q2 --> block: leave
q3 -> block: dt
block --> q4: size
@enduml
