digraph GrpcServices {
    rankdir=LR;
    compound=true;
    fontname="Helvetica";
    node [fontname="Helvetica", fontsize=10];
    edge [fontname="Helvetica", fontsize=9];

    labelloc="t";
    label="gRPC Service Definitions";
    fontsize=14;

    node [shape=record, style=filled];

    // MetricsService
    subgraph cluster_metrics {
        label="MetricsService";
        style=filled;
        fillcolor="#E8F5E9";

        metrics_svc [label="{MetricsService|+ StreamMetrics(stream Metric) → StreamAck\l+ GetCurrentState(StateRequest) → MachineState\l+ GetAllStates(Empty) → AllMachinesState\l}", fillcolor="#C8E6C9"];

        metric_msg [label="{Metric|machine_id: string\lhostname: string\ltimestamp_ms: int64\ltype: MetricType\lvalue: double\llabels: map\l}", fillcolor="#A5D6A7"];

        machine_state [label="{MachineState|machine_id: string\lhostname: string\llast_seen_ms: int64\lcurrent_metrics: Metric[]\lhealth: HealthStatus\lmetadata: map\l}", fillcolor="#A5D6A7"];
    }

    // ControlService
    subgraph cluster_control {
        label="ControlService";
        style=filled;
        fillcolor="#E3F2FD";

        control_svc [label="{ControlService|+ Control(stream Command) → stream Response\l}", fillcolor="#90CAF9"];

        commands [label="{ControlCommand|command_id: string\l|UpdateIntervalCommand\lRestartCollectionCommand\lShutdownCommand\l}", fillcolor="#64B5F6"];
    }

    // ConfigService
    subgraph cluster_config {
        label="ConfigService";
        style=filled;
        fillcolor="#FFF3E0";

        config_svc [label="{ConfigService|+ GetConfig(ConfigRequest) → CollectorConfig\l+ WatchConfig(ConfigRequest) → stream CollectorConfig\l}", fillcolor="#FFE0B2"];

        collector_config [label="{CollectorConfig|collection_interval_seconds: int32\lenabled_metrics: MetricType[]\llabels: map\lthresholds: ThresholdConfig[]\l}", fillcolor="#FFCC80"];
    }

    // Enums
    subgraph cluster_enums {
        label="Enums";
        style=filled;
        fillcolor="#F3E5F5";

        metric_type [label="{MetricType|CPU_PERCENT\lMEMORY_PERCENT\lDISK_PERCENT\lNETWORK_*\lLOAD_AVG_*\l...}", fillcolor="#E1BEE7"];

        health_status [label="{HealthStatus|HEALTHY\lWARNING\lCRITICAL\lUNKNOWN\lOFFLINE\l}", fillcolor="#CE93D8"];
    }

    // Relationships
    metrics_svc -> metric_msg [style=dashed];
    metrics_svc -> machine_state [style=dashed];
    control_svc -> commands [style=dashed];
    config_svc -> collector_config [style=dashed];
    metric_msg -> metric_type [style=dotted];
    machine_state -> health_status [style=dotted];
}