feat: collect and report 1-min load average

internal/agent/agent.go

@@ -9,6 +9,7 @@ import (
 	"bugs.watch/agent/internal/collectors"
 	"bugs.watch/agent/internal/collectors/cpu"
 	"bugs.watch/agent/internal/collectors/disk"
+	"bugs.watch/agent/internal/collectors/loadavg"
 	"bugs.watch/agent/internal/collectors/memory"
 	"bugs.watch/agent/internal/collectors/uptime"
 	"bugs.watch/agent/internal/config"
@@ -32,6 +33,7 @@ func Run(ctx context.Context, cfg config.Config) {
 		cpu.New(),
 		memory.New(),
 		disk.New(),
+		loadavg.New(),
 	}
 
 	mgr := dbmanager.New(cfg.DBConfigPath)

internal/aggregate/window.go

@@ -16,7 +16,9 @@ type Window struct {
 
 	uptime uint64
 
-	// DB metrics — populated only when a DB collector is registered.
+	load float64
+
+	// DB metrics. populated only when a DB collector is registered.
 	hasDB              bool
 	dbDriver           uint8
 	dbConnPctSum       float64
@@ -34,6 +36,7 @@ type Snapshot struct {
 	MemAvg  float64
 	DiskAvg float64
 	Uptime  uint64
+	Load    float64
 
 	// nil when DB monitoring is not enabled.
 	DBDriver         *uint8
@@ -66,6 +69,10 @@ func (w *Window) SetUptime(value uint64) {
 	w.uptime = value
 }
 
+func (w *Window) SetLoad(value float64) {
+	w.load = value
+}
+
 func (w *Window) AddDBConnPct(v float64) {
 	w.dbConnPctSum += v
 	w.dbConnPctCount++
@@ -118,6 +125,7 @@ func (w *Window) Snapshot() Snapshot {
 		MemAvg:    memAvg,
 		DiskAvg:   diskAvg,
 		Uptime:    w.uptime,
+		Load:      w.load,
 	}
 
 	if w.hasDB {

internal/collectors/loadavg/loadavg.go

@@ -0,0 +1,41 @@
+package loadavg
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	"bugs.watch/agent/internal/aggregate"
+)
+
+type Collector struct{}
+
+func New() *Collector {
+	return &Collector{}
+}
+
+func (c *Collector) Name() string {
+	return "loadavg"
+}
+
+// Collect reads /proc/loadavg and stores the 1-minute load average.
+// Failure is silently ignored by design.
+func (c *Collector) Collect(window *aggregate.Window) {
+	data, err := os.ReadFile("/proc/loadavg")
+	if err != nil {
+		return
+	}
+
+	// Format: "<load1> <load5> <load15> <running/total> <last_pid>"
+	fields := strings.Fields(string(data))
+	if len(fields) < 1 {
+		return
+	}
+
+	load1, err := strconv.ParseFloat(fields[0], 64)
+	if err != nil {
+		return
+	}
+
+	window.SetLoad(load1)
+}

internal/dbmanager/manager.go

@@ -20,7 +20,7 @@ import (
 	sqlitecol "bugs.watch/agent/internal/collectors/sqlite"
 )
 
-// Driver type identifiers — used as the db_driver field in the health payload
+// Driver type identifiers. used as the db_driver field in the health payload
 // so the dashboard can render the correct icon without parsing strings.
 const (
 	DriverNone      uint8 = 0

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"`