fix code style issues

http/attributes.go

@@ -36,7 +36,7 @@ func clientAddr(r *http.Request, trustedProxies map[string]bool) string {
 	if r.RemoteAddr == "" {
 		return ""
 	}
-	if trustedProxies == nil || len(trustedProxies) == 0 {
+	if len(trustedProxies) == 0 {
 		return r.RemoteAddr
 	}
 

http/server/server.go

@@ -80,7 +80,7 @@ func NewTrackingHandlerWithTrustedProxies(next http.Handler, trustedProxies []st
 	if !gCfg.DisableMetrics {
 		var metricsAttrs []attribute.KeyValue
 		for _, kv := range gCfg.MetricsStaticAttributes {
-			if len(kv.Key) > 0 && len(kv.Value) > 0 {
+			if kv.Key != "" && kv.Value != "" {
 				metricsAttrs = append(metricsAttrs, attribute.String(kv.Key, kv.Value))
 			}
 		}
@@ -92,7 +92,7 @@ func NewTrackingHandlerWithTrustedProxies(next http.Handler, trustedProxies []st
 	if !gCfg.DisableTraces {
 		tracesAttrs := []attribute.KeyValue{attribute.String("krakend.stage", "global")}
 		for _, kv := range gCfg.TracesStaticAttributes {
-			if len(kv.Key) > 0 && len(kv.Value) > 0 {
+			if kv.Key != "" && kv.Value != "" > 0 {
 				tracesAttrs = append(tracesAttrs, attribute.String(kv.Key, kv.Value))
 			}
 		}

http/server/traces.go

@@ -51,8 +51,7 @@ func (t *tracesHTTP) start(r *http.Request, tr *tracking) *http.Request {
 		trace.WithSpanKind(trace.SpanKindServer))
 	r = r.WithContext(tr.ctx)
 
-	var attrs []attribute.KeyValue
-	attrs = otelhttp.TraceIncomingRequestAttrs(r, t.trustedProxies)
+	attrs := otelhttp.TraceIncomingRequestAttrs(r, t.trustedProxies)
 
 	tr.span.SetAttributes(attrs...)
 	if len(t.fixedAttrs) > 0 {