following things are done:

1. Registerdnsrecordforvm api
2. removednsrecordforvm api
3. cleanup; fixed license, dao logic

Author: sudo87

api/src/main/java/com/cloud/configuration/Resource.java

@@ -38,7 +38,8 @@ enum ResourceType { // All storage type resources are allocated_storage and not
         backup_storage("backup_storage", 13),
         bucket("bucket", 14),
         object_storage("object_storage", 15),
-        gpu("gpu", 16);
+        gpu("gpu", 16),
+        dns_zone("dns_zone", 17);
 
         private String name;
         private int ordinal;

api/src/main/java/com/cloud/user/ResourceLimitService.java

@@ -56,6 +56,8 @@ public interface ResourceLimitService {
             "The default maximum number of GPU devices that can be used for a domain", false);
     static final ConfigKey<Long> DefaultMaxProjectGpus = new ConfigKey<>("Project Defaults",Long.class,"max.project.gpus","20",
             "The default maximum number of GPU devices that can be used for a project", false);
+    ConfigKey<Long> DefaultMaxDnsAccounts = new ConfigKey<>("Account Defaults",Long.class, "max.account.dns_zones","10",
+            "The default maximum number of DNS zones that can be created by an Account", true);
 
     static final List<ResourceType> HostTagsSupportingTypes = List.of(ResourceType.user_vm, ResourceType.cpu, ResourceType.memory, ResourceType.gpu);
     static final List<ResourceType> StorageTagsSupportingTypes = List.of(ResourceType.volume, ResourceType.primary_storage);

api/src/main/java/org/apache/cloudstack/api/command/user/dns/AddDnsServerCmd.java

@@ -33,8 +33,8 @@
 import org.apache.cloudstack.dns.DnsServer;
 import org.apache.commons.lang3.BooleanUtils;
 
-@APICommand(name = "addDnsServer", description = "Adds a new external DNS server",
-        responseObject = DnsServerResponse.class, requestHasSensitiveInfo = true)
+@APICommand(name = "addDnsServer", description = "Adds a new external DNS server", responseObject = DnsServerResponse.class,
+        requestHasSensitiveInfo = false, responseHasSensitiveInfo = false, since = "4.23.0")
 public class AddDnsServerCmd extends BaseCmd {
 
     @Inject

api/src/main/java/org/apache/cloudstack/api/command/user/dns/AssociateDnsZoneToNetworkCmd.java

@@ -34,7 +34,8 @@
 import com.cloud.exception.ResourceUnavailableException;
 
 @APICommand(name = "associateDnsZoneToNetwork", description = "Associates a DNS Zone with a Network for VM auto-registration",
-        responseObject = DnsZoneNetworkMapResponse.class, requestHasSensitiveInfo = false)
+        responseObject = DnsZoneNetworkMapResponse.class, requestHasSensitiveInfo = false,
+        responseHasSensitiveInfo = false, since = "4.23.0")
 public class AssociateDnsZoneToNetworkCmd extends BaseCmd {
 
     @Parameter(name = ApiConstants.DNS_ZONE_ID, type = CommandType.UUID, entityType = DnsZoneResponse.class,

api/src/main/java/org/apache/cloudstack/api/command/user/dns/CreateDnsRecordCmd.java

@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License 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.
+
 package org.apache.cloudstack.api.command.user.dns;
 
 import java.util.List;
@@ -18,7 +35,8 @@
 import com.cloud.utils.EnumUtils;
 
 @APICommand(name = "createDnsRecord", description = "Creates a DNS record directly on the provider",
-        responseObject = DnsRecordResponse.class)
+        responseObject = DnsRecordResponse.class, requestHasSensitiveInfo = false, responseHasSensitiveInfo = false,
+        since = "4.23.0")
 public class CreateDnsRecordCmd extends BaseAsyncCmd {
 
     @Parameter(name = ApiConstants.DNS_ZONE_ID, type = CommandType.UUID, entityType = DnsZoneResponse.class, required = true,

api/src/main/java/org/apache/cloudstack/api/command/user/dns/CreateDnsZoneCmd.java

@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License 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.
+
 package org.apache.cloudstack.api.command.user.dns;
 
 import javax.inject.Inject;
@@ -19,10 +36,9 @@
 import com.cloud.exception.ResourceAllocationException;
 
 @APICommand(name = "createDnsZone", description = "Creates a new DNS Zone on a specific server",
-        responseObject = DnsZoneResponse.class,
-        requestHasSensitiveInfo = false, responseHasSensitiveInfo = false)
+        responseObject = DnsZoneResponse.class, requestHasSensitiveInfo = false,
+        responseHasSensitiveInfo = false, since = "4.23.0")
 public class CreateDnsZoneCmd extends BaseAsyncCreateCmd {
-    private static final String COMMAND_RESPONSE_NAME = "creatednszoneresponse";
 
     @Inject
     DnsProviderManager dnsProviderManager;
@@ -109,11 +125,6 @@ public void execute() {
         }
     }
 
-    @Override
-    public String getCommandName() {
-        return COMMAND_RESPONSE_NAME;
-    }
-
     @Override
     public long getEntityOwnerId() {
         return CallContext.current().getCallingAccount().getId();

api/src/main/java/org/apache/cloudstack/api/command/user/dns/DeleteDnsRecordCmd.java

@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License 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.
+
 package org.apache.cloudstack.api.command.user.dns;
 
 import org.apache.cloudstack.api.APICommand;
@@ -16,7 +33,8 @@
 import com.cloud.utils.EnumUtils;
 
 @APICommand(name = "deleteDnsRecord", description = "Deletes a DNS record from the external provider",
-           responseObject = SuccessResponse.class)
+        responseObject = SuccessResponse.class, requestHasSensitiveInfo = false,
+        responseHasSensitiveInfo = false, since = "4.23.0")
 public class DeleteDnsRecordCmd extends BaseAsyncCmd {
 
     @Parameter(name = ApiConstants.DNS_ZONE_ID, type = CommandType.UUID, entityType = DnsZoneResponse.class,

api/src/main/java/org/apache/cloudstack/api/command/user/dns/DeleteDnsServerCmd.java

@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License 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.
+
 package org.apache.cloudstack.api.command.user.dns;
 
 import org.apache.cloudstack.api.APICommand;
@@ -14,10 +31,9 @@
 import com.cloud.user.Account;
 
 @APICommand(name = "deleteDnsServer", description = "Removes a DNS server integration",
-        responseObject = SuccessResponse.class,
-        requestHasSensitiveInfo = false, responseHasSensitiveInfo = false)
+        responseObject = SuccessResponse.class, requestHasSensitiveInfo = false,
+        responseHasSensitiveInfo = false, since = "4.23.0")
 public class DeleteDnsServerCmd extends BaseAsyncCmd {
-    private static final String COMMAND_RESPONSE_NAME = "deletednsserverresponse";
 
     /////////////////////////////////////////////////////
     //////////////// API Parameters /////////////////////
@@ -54,11 +70,6 @@ public void execute() {
         }
     }
 
-    @Override
-    public String getCommandName() {
-        return COMMAND_RESPONSE_NAME;
-    }
-
     @Override
     public long getEntityOwnerId() {
         // Look up the server to find its owner.

api/src/main/java/org/apache/cloudstack/api/command/user/dns/DeleteDnsZoneCmd.java

@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License 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.
+
 package org.apache.cloudstack.api.command.user.dns;
 
 import org.apache.cloudstack.api.APICommand;
@@ -14,10 +31,9 @@
 import com.cloud.user.Account;
 
 @APICommand(name = "deleteDnsZone", description = "Removes a DNS Zone from CloudStack and the external provider",
-        responseObject = SuccessResponse.class,
-        requestHasSensitiveInfo = false, responseHasSensitiveInfo = false)
+        responseObject = SuccessResponse.class, requestHasSensitiveInfo = false, responseHasSensitiveInfo = false,
+        since = "4.23.0")
 public class DeleteDnsZoneCmd extends BaseAsyncCmd {
-    private static final String COMMAND_RESPONSE_NAME = "deletednszoneresponse";
 
     /////////////////////////////////////////////////////
     //////////////// API Parameters /////////////////////
@@ -53,11 +69,6 @@ public void execute() {
         }
     }
 
-    @Override
-    public String getCommandName() {
-        return COMMAND_RESPONSE_NAME;
-    }
-
     @Override
     public long getEntityOwnerId() {
         // Look up the Zone to find the Account Owner

api/src/main/java/org/apache/cloudstack/api/command/user/dns/DisassociateDnsZoneFromNetworkCmd.java

@@ -34,7 +34,7 @@
 import com.cloud.user.Account;
 
 @APICommand(name = "disassociateDnsZoneFromNetwork", description = "Removes the association between a DNS Zone and a Network",
-        responseObject = SuccessResponse.class)
+        responseObject = SuccessResponse.class, requestHasSensitiveInfo = false, responseHasSensitiveInfo = false, since = "4.23.0")
 public class DisassociateDnsZoneFromNetworkCmd extends BaseCmd {
 
     @Parameter(name = ApiConstants.ID, type = CommandType.UUID, entityType = DnsZoneNetworkMapResponse.class,