fix sonar

Author: hjgraca

libraries/src/AWS.Lambda.Powertools.Tracing/Internal/TracingAspectHandler.cs

@@ -55,12 +55,12 @@ internal class TracingAspectHandler : IMethodAspectHandler
     /// <summary>
     ///     Tracing namespace
     /// </summary>
-    private string _namespace;
+    private readonly string _namespace;
 
     /// <summary>
     ///     The capture mode
     /// </summary>
-    private TracingCaptureMode _captureMode;
+    private readonly TracingCaptureMode _captureMode;
 
     /// <summary>
     ///     The segment name

libraries/src/AWS.Lambda.Powertools.Tracing/TracingAttribute.cs

@@ -1,18 +1,19 @@
 /*
  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License").
  * You may not use this file except in compliance with the License.
  * A copy of the License is located at
- * 
+ *
  *  http://aws.amazon.com/apache2.0
- * 
+ *
  * or in the "license" file accompanying this file. This file is distributed
  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
  * express or implied. See the License for the specific language governing
  * permissions and limitations under the License.
  */
 
+using System;
 using AWS.Lambda.Powertools.Common;
 using AWS.Lambda.Powertools.Tracing.Internal;
 
@@ -105,6 +106,7 @@ namespace AWS.Lambda.Powertools.Tracing;
 ///         }
 ///     </code>
 /// </example>
+[AttributeUsage(AttributeTargets.Method)]
 public class TracingAttribute : MethodAspectAttribute
 {
     /// <summary>