@startuml
Autonumber
Skinparam sequenceArrowThickness 2
skinparam ParticipantPadding 5
skinparam BoxPadding 10

Box SMO #gold
    Participant SMO_O1 as “O1” <<OAM>>
    Participant RPGE as “Non-RT RIC” <<NONRTRIC>>
End box

Box “O-RAN RIC” #lightpink
    Participant A1TERM as “A1 MED” <<RIC>>
    Participant O1TERM as “O1 TERM” <<RIC>>
    Participant HC as "HealthCk Function" <<RIC>>
    Participant MOD as "Platform Modules" <<RIC>>
    Participant xAPP as “xAPPs” <<RICAPP>>
    Participant E2TERM as “E2 TERM” <<RIC>>
End box

Box “O-RAN Managed Function (MF)” #lightpink
    Participant MF as “Managed Function” <<MF>>
End box
Note over MF : MF = O-CU, O-DU

=== Alarms from individual RIC Platform Modules and xAPPs ==
Note over RPGE,HC
Note: Apart from Health-Checks, a platform module or xAPP may generate an alarm (or
its clearing) when it encounters a failure/error (e.g., failure to reach another module)
End Note

MOD -> O1TERM : Platform Module Alarm/Clear
O1TERM -> SMO_O1 : <<O1VES>> Alarm or Clear
xAPP -> O1TERM : xAPP Alarm/Clear
O1TERM -> SMO_O1 : <<O1VES>> Alarm or Clear

=== RIC Self-Checks @ Regular Intervals ==

Note over A1TERM,HC #lightsalmon
 Support HealthCheck Telemetry (FM, Heartbeat, PM)
End note

Note over HC 
 RIC Self-Checks Initiated
End note

Group loop for each Platform Module
HC -> MOD : Perform HealthCheck
Note Left 
 Support Platform Module HealthCheck
End Note
MOD -> HC : HealthCheck Status
End

HC -> O1TERM : Platform Module Alarm/Clear
O1TERM -> SMO_O1 : <<O1VES>> Alarm or Clear


Group loop for each xAPP instance deployed
HC -> xAPP : Perform HealthCheck
xAPP -> HC : HealthCheck Status
Note Left #lightsalmon
 Support xAPP HealthCheck
End note
End

HC -> O1TERM : xAPP Alarm/Clear
O1TERM -> SMO_O1 : <<O1VES>> Alarm or Clear

MF -> E2TERM : <<E2>> keep-alive
Note Left #lightsalmon : Support E2 Test Message Processing
E2TERM -> HC : <<E2>> missed heartbeat

HC -> O1TERM : E2 Alarm/Clear
O1TERM -> SMO_O1 : <<O1VES>> Alarm or Clear

HC -> O1TERM : Log HC results & update \nalarm-list in yang model
Note Left #lightsalmon : Support Alarm Retrieval from SMO, Dashboard






@enduml