add the feature for observability

pkg/metrics/runtime.go

@@ -0,0 +1,27 @@
+package metrics
+
+import (
+	otelruntime "go.opentelemetry.io/contrib/instrumentation/runtime"
+)
+
+// InitRuntimeMetrics initializes Go runtime metrics instrumentation.
+// This includes CPU, memory, GC, and goroutine metrics.
+// The runtime instrumentation automatically collects:
+// - CPU usage (go_cpu_*)
+// - Memory allocation and heap stats (go_memstats_*)
+// - GC statistics (go_memstats_gc_*)
+// - Goroutine count (go_goroutines)
+func InitRuntimeMetrics() error {
+	if !IsEnabled() {
+		return nil
+	}
+
+	// Start OpenTelemetry runtime metrics collection
+	// This automatically collects Go runtime metrics
+	err := otelruntime.Start(otelruntime.WithMinimumReadMemStatsInterval(0))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}