feat: collect and report 1-min load average

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)
+}