Mark code that has been deleted in V4 as obsolete in V3

sdk/src/Services/EC2/Custom/Util/ImageUtilities.cs

@@ -37,6 +37,8 @@ namespace Amazon.EC2.Util
     /// <summary>
     /// This class has utility methods for finding common Amazon machine images.
     /// </summary>
+    /// 
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public static partial class ImageUtilities
     {
         #region ImageKeys

sdk/src/Services/EC2/Custom/Util/LaunchNATInstanceRequest.cs

@@ -28,6 +28,7 @@ namespace Amazon.EC2.Util
     /// <summary>
     /// Request class to launch a NAT instance
     /// </summary>
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public class LaunchNATInstanceRequest
     {
         string subnetId;

sdk/src/Services/EC2/Custom/Util/LaunchVPCWithPublicAndPrivateSubnetsRequest.cs

@@ -28,6 +28,7 @@ namespace Amazon.EC2.Util
     /// The properties used to create a VPC, a public subnet, private subnet and a NAT EC2 instance to allow EC2 instances in the private
     /// subnet to establish outbound connections to the internet.
     /// </summary>
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public class LaunchVPCWithPublicAndPrivateSubnetsRequest : LaunchVPCWithPublicSubnetRequest
     {
         string privateSubnetCiderBlock = "10.0.1.0/24";

sdk/src/Services/EC2/Custom/Util/LaunchVPCWithPublicAndPrivateSubnetsResponse.cs

@@ -28,6 +28,7 @@ namespace Amazon.EC2.Util
     /// <summary>
     /// This object contains the VPC objects that were created as part of the launch VPC with public and private subnets operation.
     /// </summary>
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public class LaunchVPCWithPublicAndPrivateSubnetsResponse : LaunchVPCWithPublicSubnetResponse
     {
         /// <summary>

sdk/src/Services/EC2/Custom/Util/LaunchVPCWithPublicSubnetRequest.cs

@@ -27,6 +27,7 @@ namespace Amazon.EC2.Util
     /// <summary>
     /// The properties used to create a VPC with a subnet that will have an internet gateway attached making instances available to the internet.
     /// </summary>
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public class LaunchVPCWithPublicSubnetRequest
     {
         string vpcName;

sdk/src/Services/EC2/Custom/Util/LaunchVPCWithPublicSubnetResponse.cs

@@ -29,6 +29,7 @@ namespace Amazon.EC2.Util
     /// <summary>
     /// This object contains the VPC objects that were created as part of the launch VPC with public subnet operation.
     /// </summary>
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public class LaunchVPCWithPublicSubnetResponse
     {
         /// <summary>

sdk/src/Services/EC2/Custom/Util/VPCUtilities.cs

@@ -33,6 +33,7 @@ namespace Amazon.EC2.Util
     /// <summary>
     /// This class has utility methods used for setting up a VPC.
     /// </summary>
+    [Obsolete("This utility class is no longer maintained and will be removed in the next major version.")]
     public static partial class VPCUtilities
     {
         /// <summary>