chore: add system metrics

backend/internal/grpcsrv/collector/tracker.go

@@ -97,15 +97,69 @@ func (t *ConnTracker) UpdateServices(id string, services []Service) bool {
 	return true
 }
 
+// UpdateSystemMetrics updates the system metrics for the given agent.
+func (t *ConnTracker) UpdateSystemMetrics(id string, metrics SystemMetrics) bool {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	agent, ok := t.agents[id]
+	if !ok {
+		return false
+	}
+	agent.SystemMetrics = metrics
+	return true
+}
+
+// GetSystemMetrics returns system metrics for all connected agents.
+func (t *ConnTracker) GetSystemMetrics() map[string]AgentMetricsInfo {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	result := make(map[string]AgentMetricsInfo)
+	for id, agent := range t.agents {
+		result[id] = AgentMetricsInfo{
+			ID:            id,
+			Label:         agent.Label,
+			ConnectedAt:   agent.ConnectedAt,
+			CPUPercent:    agent.SystemMetrics.CPUPercent,
+			MemoryPercent: agent.SystemMetrics.MemoryPercent,
+			DiskPercent:   agent.SystemMetrics.DiskPercent,
+			NetworkRxBytes: agent.SystemMetrics.NetworkRxBytes,
+			NetworkTxBytes: agent.SystemMetrics.NetworkTxBytes,
+		}
+	}
+	return result
+}
+
 // Service represents a named service with its current status.
 type Service struct {
 	Name, Status string
 }
 
+// SystemMetrics represents system resource metrics.
+type SystemMetrics struct {
+	CPUPercent    float64
+	MemoryPercent float64
+	DiskPercent   float64
+	NetworkRxBytes float64
+	NetworkTxBytes float64
+}
+
+// AgentMetricsInfo contains agent info with its system metrics.
+type AgentMetricsInfo struct {
+	ID             string    `json:"id"`
+	Label          string    `json:"label"`
+	ConnectedAt    time.Time `json:"connected_at"`
+	CPUPercent     float64   `json:"cpu_percent"`
+	MemoryPercent  float64   `json:"memory_percent"`
+	DiskPercent    float64   `json:"disk_percent"`
+	NetworkRxBytes float64   `json:"network_rx_bytes"`
+	NetworkTxBytes float64   `json:"network_tx_bytes"`
+}
+
 // Agent represents a connected agent streaming logs to the collector.
 type Agent struct {
-	ID          string
-	Label       string
-	Services    []Service
-	ConnectedAt time.Time
+	ID            string
+	Label         string
+	Services      []Service
+	SystemMetrics SystemMetrics
+	ConnectedAt   time.Time
 }