feat: collect and report 1-min load average

internal/sender/http.go

@@ -38,6 +38,7 @@ func (s *HTTPSender) Send(ctx context.Context, snap aggregate.Snapshot) error {
 		MemAvg:           snap.MemAvg,
 		DiskAvg:          snap.DiskAvg,
 		Uptime:           snap.Uptime,
+		Load:             snap.Load,
 		HostID:           s.hostID,
 		Environment:      s.env,
 		DBDriver:         snap.DBDriver,

internal/sender/logging.go

@@ -22,11 +22,12 @@ func (s *LoggingSender) Send(ctx context.Context, snap aggregate.Snapshot) error
 		return ctx.Err()
 	default:
 		log.Printf(
-			"SEND cpu=%.2f%% mem=%.2f%% disk=%.2f%% uptime=%ds",
+			"SEND cpu=%.2f%% mem=%.2f%% disk=%.2f%% uptime=%ds load=%.2f",
 			snap.CPUAvg,
 			snap.MemAvg,
 			snap.DiskAvg,
 			snap.Uptime,
+			snap.Load,
 		)
 		return nil
 	}

internal/sender/payload.go

@@ -10,11 +10,12 @@ type SnapshotPayload struct {
 	MemAvg  float64 `json:"mem_avg"`
 	DiskAvg float64 `json:"disk_avg"`
 	Uptime  uint64  `json:"uptime"`
+	Load    float64 `json:"load"`
 
 	HostID      string `json:"host_id,omitempty"`
 	Environment string `json:"environment,omitempty"`
 
-	// Optional — only present when DB monitoring is enabled.
+	// Optional. only present when DB monitoring is enabled.
 	// DBDriver is a numeric identifier: 1=mysql/mariadb 2=postgres 3=redis 4=mongodb 5=sqlite
 	DBDriver         *uint8   `json:"db_driver,omitempty"`
 	DBConnPct        *float64 `json:"db_conn_pct,omitempty"`