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如图所示，右半部分无法显示。该图在 plantuml oneline server 正常。

@startuml PD Leader Internal Flow (Fixed)
!theme plain

title PD Leader Internal Core Flow (Simplified)

start

partition "Request Ingestion" {
    :Receive gRPC/HTTP Request;
    :Dispatch Request based on Type;
}

if (Request is Heartbeat?) then (Heartbeat)
    partition "Heartbeat Processing" {
        :Update Statistics (pkg/statistics);
        :Update In-Memory Cluster State (pkg/core);
        note right: Trigger scheduling check
        -->[Trigger] CheckSchedulingNeeded;
    }
    partition "Scheduling Cycle" {
        :CheckSchedulingNeeded;
        if (Scheduling Needed? by Checkers) then (yes)
          :Select Scheduler(s);
          :Generate Operator(s) (pkg/schedule/operator);
          :Add Operator(s) to Controller Queue;
          note right: Operator will be included\nin Heartbeat Response
        else (no)
          :No Operator Generated;
        endif
        --> PrepareHeartbeatResponse;
    }
    partition "Response Sending" {
        :PrepareHeartbeatResponse;
        :Send Heartbeat Response (to TiKV);
        --> (*) EndHeartbeatFlow;
    }

elseif (Request is TSO?) then (TSO)
    partition "TSO Allocation" {
        :Allocate TSO Batch (pkg/tso);
        fork
           :Prepare TSO Response;
           --> SendTSOResponse;
        fork again
            :Persist Max Allocated TSO to Etcd (Async);
        end fork
    }
    partition "Response Sending" {
        :SendTSOResponse;
        :Send TSO Response (to TiKV/TiDB);
        --> (*) EndTSOFlow;
    }


else (Metadata/API)
    partition "Metadata & Other API Service" {
        :Handle API Request Logic (e.g., Get Status, Update Config);
        :Access Storage Layer (pkg/storage);
        note left: Interacts with Etcd
        :Prepare API Response;
        --> SendAPIResponse;
    }
    partition "Response Sending" {
        :SendAPIResponse;
        :Send API Response (to TiDB/pd-ctl/Dashboard);
        --> (*) EndAPIFlow;
    }
endif

' Define common stop points (using explicit labels before stop)
:EndHeartbeatFlow;
stop
:EndTSOFlow;
stop
:EndAPIFlow;
stop

@enduml
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