feat(collectors) basic implementation of boring collectors; sender via http(s) to hard coded api route

internal/collectors/uptime/uptime.go

@@ -0,0 +1,41 @@
+package uptime
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	"bugs.watch/agent/internal/aggregate"
+)
+
+type Collector struct{}
+
+func New() *Collector {
+	return &Collector{}
+}
+
+func (c *Collector) Name() string {
+	return "uptime"
+}
+
+// Collect reads /proc/uptime and stores the latest uptime in seconds.
+// Failure is silently ignored by design.
+func (c *Collector) Collect(window *aggregate.Window) {
+	data, err := os.ReadFile("/proc/uptime")
+	if err != nil {
+		return
+	}
+
+	// Format: "<uptime_seconds> <idle_seconds>"
+	fields := strings.Fields(string(data))
+	if len(fields) < 1 {
+		return
+	}
+
+	seconds, err := strconv.ParseFloat(fields[0], 64)
+	if err != nil {
+		return
+	}
+
+	window.SetUptime(uint64(seconds))
+}