fix: linter run and gosec fix

internal/metrics/metrics.go

@@ -2,8 +2,10 @@ package metrics
 
 import (
 	"fmt"
+	"log"
 	"net/http"
 	"sync"
+	"time"
 )
 
 var (
@@ -39,7 +41,6 @@ func IncLogParsed() {
 
 func MetricsHandler() http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-
 		metricsMu.RLock()
 		snapshot := make(map[string]int64, len(metrics))
 		for k, v := range metrics {
@@ -51,15 +52,27 @@ func MetricsHandler() http.Handler {
 
 		for name, value := range snapshot {
 			metricName := name + "_total"
-			fmt.Fprintf(w, "# TYPE %s counter\n", metricName)
-			fmt.Fprintf(w, "%s %d\n", metricName, value)
+			_, _ = fmt.Fprintf(w, "# TYPE %s counter\n", metricName)
+			_, _ = fmt.Fprintf(w, "%s %d\n", metricName, value)
 		}
 	})
 }
+
 func StartMetricsServer(port int) {
-	http.Handle("/metrics", MetricsHandler())
-	addr := fmt.Sprintf(":%d", port)
-	if err := http.ListenAndServe(addr, nil); err != nil {
+	mux := http.NewServeMux()
+	mux.Handle("/metrics", MetricsHandler())
+
+	server := &http.Server{
+		Addr:         fmt.Sprintf(":%d", port),
+		Handler:      mux,
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 10 * time.Second,
+		IdleTimeout:  15 * time.Second,
+	}
+
+	log.Printf("Starting metrics server on %s", server.Addr)
+	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		log.Printf("Metrics server error: %v", err)
 	}
 }