diff --git a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json
index c38c0a7c94ea..42b4aac93aec 100644
--- a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json
+++ b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json
@@ -402,6 +402,9 @@
           "202": {
             "description": "Started - the container group is starting."
           },
+          "204": {
+            "description": "Started - the container group is already running or starting."
+          },
           "default": {
             "description": "Error response describing why the operation failed.",
             "schema": {
@@ -765,6 +768,53 @@
           }
         }
       }
+    },
+    "/subscriptions/{subscriptionId}/resourcegroups/{resourceGroupName}/providers/Microsoft.Network/virtualNetworks/{virtualNetworkName}/subnets/{subnetName}/providers/Microsoft.ContainerInstance/serviceAssociationLinks/default": {
+      "delete": {
+        "operationId": "SubnetServiceAssociationLink_Delete",
+        "x-ms-examples": {
+          "SubnetServiceAssociationLinkDelete": {
+            "$ref": "./examples/SubnetServiceAssociationLinkDelete.json"
+          }
+        },
+        "summary": "Delete container group virtual network association links.",
+        "description": "Delete container group virtual network association links. The operation does not delete other resources provided by the user.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "#/parameters/VirtualNetworkNameParameter"
+          },
+          {
+            "$ref": "#/parameters/SubnetNameParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK"
+          },
+          "202": {
+            "description": "Delete started."
+          },
+          "204": {
+            "description": "No Content - the specified container group was not found."
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
+          }
+        },
+        "x-ms-long-running-operation": true
+      }
     }
   },
   "definitions": {
@@ -1257,150 +1307,154 @@
           "$ref": "#/definitions/Resource"
         },
         {
+          "$ref": "#/definitions/ContainerGroupProperties"
+        }
+      ]
+    },
+    "ContainerGroupProperties": {
+      "description": "The container group properties",
+      "type": "object",
+      "required": [
+        "properties"
+      ],
+      "properties": {
+        "identity": {
+          "$ref": "#/definitions/ContainerGroupIdentity",
+          "description": "The identity of the container group, if configured."
+        },
+        "properties": {
+          "x-ms-client-flatten": true,
           "type": "object",
-          "required": [
-            "properties"
-          ],
+          "description": "The container group properties",
           "properties": {
-            "identity": {
-              "$ref": "#/definitions/ContainerGroupIdentity",
-              "description": "The identity of the container group, if configured."
+            "provisioningState": {
+              "readOnly": true,
+              "type": "string",
+              "description": "The provisioning state of the container group. This only appears in the response."
+            },
+            "containers": {
+              "type": "array",
+              "description": "The containers within the container group.",
+              "items": {
+                "$ref": "#/definitions/Container"
+              },
+              "x-ms-identifiers": [
+                "name"
+              ]
             },
-            "properties": {
-              "x-ms-client-flatten": true,
+            "imageRegistryCredentials": {
+              "type": "array",
+              "description": "The image registry credentials by which the container group is created from.",
+              "items": {
+                "$ref": "#/definitions/ImageRegistryCredential"
+              },
+              "x-ms-identifiers": [
+                "username"
+              ]
+            },
+            "restartPolicy": {
+              "type": "string",
+              "description": "Restart policy for all containers within the container group. \n- `Always` Always restart\n- `OnFailure` Restart on failure\n- `Never` Never restart\n",
+              "enum": [
+                "Always",
+                "OnFailure",
+                "Never"
+              ],
+              "x-ms-enum": {
+                "name": "ContainerGroupRestartPolicy",
+                "modelAsString": true
+              }
+            },
+            "ipAddress": {
+              "description": "The IP address type of the container group.",
+              "$ref": "#/definitions/IpAddress"
+            },
+            "osType": {
+              "type": "string",
+              "description": "The operating system type required by the containers in the container group.",
+              "enum": [
+                "Windows",
+                "Linux"
+              ],
+              "x-ms-enum": {
+                "name": "OperatingSystemTypes",
+                "modelAsString": true
+              }
+            },
+            "volumes": {
+              "type": "array",
+              "description": "The list of volumes that can be mounted by containers in this container group.",
+              "items": {
+                "$ref": "#/definitions/Volume"
+              },
+              "x-ms-identifiers": [
+                "name"
+              ]
+            },
+            "instanceView": {
+              "description": "The instance view of the container group. Only valid in response.",
+              "readOnly": true,
               "type": "object",
-              "description": "The container group properties",
               "properties": {
-                "provisioningState": {
+                "events": {
+                  "description": "The events of this container group.",
                   "readOnly": true,
-                  "type": "string",
-                  "description": "The provisioning state of the container group. This only appears in the response."
-                },
-                "containers": {
                   "type": "array",
-                  "description": "The containers within the container group.",
                   "items": {
-                    "$ref": "#/definitions/Container"
+                    "$ref": "#/definitions/Event"
                   },
                   "x-ms-identifiers": [
-                    "name"
+                    "name",
+                    "type"
                   ]
                 },
-                "imageRegistryCredentials": {
-                  "type": "array",
-                  "description": "The image registry credentials by which the container group is created from.",
-                  "items": {
-                    "$ref": "#/definitions/ImageRegistryCredential"
-                  },
-                  "x-ms-identifiers": [
-                    "username"
-                  ]
-                },
-                "restartPolicy": {
-                  "type": "string",
-                  "description": "Restart policy for all containers within the container group. \n- `Always` Always restart\n- `OnFailure` Restart on failure\n- `Never` Never restart\n",
-                  "enum": [
-                    "Always",
-                    "OnFailure",
-                    "Never"
-                  ],
-                  "x-ms-enum": {
-                    "name": "ContainerGroupRestartPolicy",
-                    "modelAsString": true
-                  }
-                },
-                "ipAddress": {
-                  "description": "The IP address type of the container group.",
-                  "$ref": "#/definitions/IpAddress"
-                },
-                "osType": {
-                  "type": "string",
-                  "description": "The operating system type required by the containers in the container group.",
-                  "enum": [
-                    "Windows",
-                    "Linux"
-                  ],
-                  "x-ms-enum": {
-                    "name": "OperatingSystemTypes",
-                    "modelAsString": true
-                  }
-                },
-                "volumes": {
-                  "type": "array",
-                  "description": "The list of volumes that can be mounted by containers in this container group.",
-                  "items": {
-                    "$ref": "#/definitions/Volume"
-                  },
-                  "x-ms-identifiers": [
-                    "name"
-                  ]
-                },
-                "instanceView": {
-                  "description": "The instance view of the container group. Only valid in response.",
+                "state": {
                   "readOnly": true,
-                  "type": "object",
-                  "properties": {
-                    "events": {
-                      "description": "The events of this container group.",
-                      "readOnly": true,
-                      "type": "array",
-                      "items": {
-                        "$ref": "#/definitions/Event"
-                      },
-                      "x-ms-identifiers": [
-                        "name",
-                        "type"
-                      ]
-                    },
-                    "state": {
-                      "readOnly": true,
-                      "type": "string",
-                      "description": "The state of the container group. Only valid in response."
-                    }
-                  }
-                },
-                "diagnostics": {
-                  "description": "The diagnostic information for a container group.",
-                  "$ref": "#/definitions/ContainerGroupDiagnostics"
-                },
-                "subnetIds": {
-                  "type": "array",
-                  "description": "The subnet resource IDs for a container group.",
-                  "items": {
-                    "$ref": "#/definitions/ContainerGroupSubnetId"
-                  }
-                },
-                "dnsConfig": {
-                  "description": "The DNS config information for a container group.",
-                  "$ref": "#/definitions/DnsConfiguration"
-                },
-                "sku": {
-                  "description": "The SKU for a container group.",
-                  "$ref": "#/definitions/ContainerGroupSku"
-                },
-                "encryptionProperties": {
-                  "description": "The encryption properties for a container group.",
-                  "$ref": "#/definitions/EncryptionProperties"
-                },
-                "initContainers": {
-                  "type": "array",
-                  "description": "The init containers for a container group.",
-                  "items": {
-                    "$ref": "#/definitions/InitContainerDefinition"
-                  },
-                  "x-ms-identifiers": [
-                    "name"
-                  ]
+                  "type": "string",
+                  "description": "The state of the container group. Only valid in response."
                 }
+              }
+            },
+            "diagnostics": {
+              "description": "The diagnostic information for a container group.",
+              "$ref": "#/definitions/ContainerGroupDiagnostics"
+            },
+            "subnetIds": {
+              "type": "array",
+              "description": "The subnet resource IDs for a container group.",
+              "items": {
+                "$ref": "#/definitions/ContainerGroupSubnetId"
+              }
+            },
+            "dnsConfig": {
+              "description": "The DNS config information for a container group.",
+              "$ref": "#/definitions/DnsConfiguration"
+            },
+            "sku": {
+              "description": "The SKU for a container group.",
+              "$ref": "#/definitions/ContainerGroupSku"
+            },
+            "encryptionProperties": {
+              "description": "The encryption properties for a container group.",
+              "$ref": "#/definitions/EncryptionProperties"
+            },
+            "initContainers": {
+              "type": "array",
+              "description": "The init containers for a container group.",
+              "items": {
+                "$ref": "#/definitions/InitContainerDefinition"
               },
-              "required": [
-                "containers",
-                "osType"
+              "x-ms-identifiers": [
+                "name"
               ]
             }
-          }
+          },
+          "required": [
+            "containers",
+            "osType"
+          ]
         }
-      ]
+      }
     },
     "ContainerGroupIdentity": {
       "description": "Identity for the container group.",
@@ -1431,25 +1485,30 @@
         },
         "userAssignedIdentities": {
           "type": "object",
-          "description": "The list of user identities associated with the container group. The user identity dictionary key references will be ARM resource ids in the form: '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ManagedIdentity/userAssignedIdentities/{identityName}'.",
+          "description": "The list of user identities associated with the container group.",
           "additionalProperties": {
-            "type": "object",
-            "properties": {
-              "principalId": {
-                "readOnly": true,
-                "type": "string",
-                "description": "The principal id of user assigned identity."
-              },
-              "clientId": {
-                "readOnly": true,
-                "type": "string",
-                "description": "The client id of user assigned identity."
-              }
-            }
+            "description": "The list of user identities associated with the container group. The user identity dictionary key references will be ARM resource ids in the form: '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ManagedIdentity/userAssignedIdentities/{identityName}'.",
+            "$ref": "#/definitions/UserAssignedIdentities"
           }
         }
       }
     },
+    "UserAssignedIdentities": {
+      "type": "object",
+      "description": "The list of user identities associated with the container group. The user identity dictionary key references will be ARM resource ids in the form: '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ManagedIdentity/userAssignedIdentities/{identityName}'.",
+      "properties": {
+        "principalId": {
+          "readOnly": true,
+          "type": "string",
+          "description": "The principal id of user assigned identity."
+        },
+        "clientId": {
+          "readOnly": true,
+          "type": "string",
+          "description": "The client id of user assigned identity."
+        }
+      }
+    },
     "ImageRegistryCredential": {
       "description": "Image registry credential.",
       "type": "object",
@@ -1476,8 +1535,7 @@
         }
       },
       "required": [
-        "server",
-        "username"
+        "server"
       ]
     },
     "ContainerGroupDiagnostics": {
@@ -1500,7 +1558,8 @@
         },
         "workspaceKey": {
           "description": "The workspace key for log analytics",
-          "type": "string"
+          "type": "string",
+          "x-ms-secret": true
         },
         "logType": {
           "type": "string",
@@ -1523,7 +1582,8 @@
         },
         "workspaceResourceId": {
           "description": "The workspace resource id for log analytics",
-          "type": "string"
+          "type": "string",
+          "x-ms-secret": true
         }
       },
       "required": [
@@ -1582,7 +1642,7 @@
           "type": "string",
           "description": "The Dns name label for the IP."
         },
-        "dnsNameLabelReusePolicy": {
+        "autoGeneratedDomainNameLabelScope": {
           "type": "string",
           "description": "The value representing the security enum.",
           "enum": [
@@ -1592,8 +1652,9 @@
             "ResourceGroupReuse",
             "Noreuse"
           ],
+          "default": "Unsecure",
           "x-ms-enum": {
-            "name": "AutoGeneratedDomainNameLabelScope",
+            "name": "dnsNameLabelReusePolicy",
             "modelAsString": true
           }
         },
@@ -1674,7 +1735,8 @@
         },
         "secureValue": {
           "type": "string",
-          "description": "The value of the secure environment variable."
+          "description": "The value of the secure environment variable.",
+          "x-ms-secret": true
         }
       },
       "required": [
@@ -1775,6 +1837,11 @@
       "description": "A single usage result",
       "type": "object",
       "properties": {
+        "id": {
+          "readOnly": true,
+          "type": "string",
+          "description": "Id of the usage result"
+        },
         "unit": {
           "readOnly": true,
           "type": "string",
@@ -2295,6 +2362,22 @@
       "description": "The name of the container group.",
       "x-ms-parameter-location": "method"
     },
+    "VirtualNetworkNameParameter": {
+      "name": "virtualNetworkName",
+      "in": "path",
+      "required": true,
+      "type": "string",
+      "description": "The name of the virtual network.",
+      "x-ms-parameter-location": "method"
+    },
+    "SubnetNameParameter": {
+      "name": "subnetName",
+      "in": "path",
+      "required": true,
+      "type": "string",
+      "description": "The name of the subnet.",
+      "x-ms-parameter-location": "method"
+    },
     "OperationIdParameter": {
       "name": "operationId",
       "in": "path",
diff --git a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsCreateOrUpdate.json b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsCreateOrUpdate.json
index 34740ff58db0..3bfd34a4823a 100644
--- a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsCreateOrUpdate.json
+++ b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsCreateOrUpdate.json
@@ -91,7 +91,7 @@
           ],
           "type": "Public",
           "dnsNameLabel": "dnsnamelabel1",
-          "dnsNameLabelReusePolicy": "Unsecure"
+          "autoGeneratedDomainNameLabelScope": "Unsecure"
         },
         "osType": "Linux",
         "volumes": [
@@ -172,8 +172,7 @@
           ],
           "diagnostics": {
             "logAnalytics": {
-              "workspaceId": "workspaceid",
-              "workspaceKey": ""
+              "workspaceId": "workspaceid"
             }
           },
           "dnsConfig": {
@@ -194,7 +193,7 @@
             ],
             "type": "Public",
             "dnsNameLabel": "dnsnamelabel1",
-            "dnsNameLabelReusePolicy": "Unsecure",
+            "autoGeneratedDomainNameLabelScope": "Unsecure",
             "fqdn": "dnsnamelabel1.azure-container.io"
           },
           "osType": "Linux",
@@ -287,7 +286,7 @@
             ],
             "type": "Public",
             "dnsNameLabel": "dnsnamelabel1",
-            "dnsNameLabelReusePolicy": "Unsecure",
+            "autoGeneratedDomainNameLabelScope": "Unsecure",
             "fqdn": "dnsnamelabel1.azure-container.io"
           },
           "osType": "Linux",
diff --git a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsStart.json b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsStart.json
index 090130571b4c..9689e0e3f6fd 100644
--- a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsStart.json
+++ b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/ContainerGroupsStart.json
@@ -6,6 +6,7 @@
     "containerGroupName": "demo1"
   },
   "responses": {
-    "202": {}
+    "202": {},
+    "204": {}
   }
 }
diff --git a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/SubnetServiceAssociationLinkDelete.json b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/SubnetServiceAssociationLinkDelete.json
new file mode 100644
index 000000000000..d848978dfdf4
--- /dev/null
+++ b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/examples/SubnetServiceAssociationLinkDelete.json
@@ -0,0 +1,14 @@
+{
+  "parameters": {
+    "subscriptionId": "subid",
+    "api-version": "2021-10-01",
+    "resourceGroupName": "demo",
+    "virtualNetworkName": "demo2",
+    "subnetName": "demo3"
+  },
+  "responses": {
+    "200": {},
+    "202": {},
+    "204": {}
+  }
+}