Api Management 2021-08-01 Stable API-VERSION (#16353)

* Adds base for updating Microsoft.ApiManagement from version preview/2021-04-01-preview to version 2021-08-01

* Updates readme

* Updates API version in new specs and examples

specification/apimanagement/resource-manager/Microsoft.ApiManagement/stable/2021-08-01/apimapisByTags.json

@@ -0,0 +1,106 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "ApiManagementClient",
+    "description": "Use these REST APIs for performing retrieve a collection of Apis associated with a tag in Azure API Management deployment.",
+    "version": "2021-08-01"
+  },
+  "host": "management.azure.com",
+  "schemes": [
+    "https"
+  ],
+  "consumes": [
+    "application/json"
+  ],
+  "produces": [
+    "application/json"
+  ],
+  "security": [
+    {
+      "azure_auth": [
+        "user_impersonation"
+      ]
+    }
+  ],
+  "securityDefinitions": {
+    "azure_auth": {
+      "type": "oauth2",
+      "authorizationUrl": "https://login.microsoftonline.com/common/oauth2/authorize",
+      "flow": "implicit",
+      "description": "Azure Active Directory OAuth2 Flow.",
+      "scopes": {
+        "user_impersonation": "impersonate your user account"
+      }
+    }
+  },
+  "paths": {
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ApiManagement/service/{serviceName}/apisByTags": {
+      "get": {
+        "tags": [
+          "ApisByTag"
+        ],
+        "operationId": "Api_ListByTags",
+        "description": "Lists a collection of apis associated with tags.",
+        "x-ms-examples": {
+          "ApiManagementListApisByTags": {
+            "$ref": "./examples/ApiManagementListApisByTags.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "./apimanagement.json#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "./apimanagement.json#/parameters/ServiceNameParameter"
+          },
+          {
+            "name": "$filter",
+            "in": "query",
+            "required": false,
+            "type": "string",
+            "description": "|     Field     |     Usage     |     Supported operators     |     Supported functions     |</br>|-------------|-------------|-------------|-------------|</br>| name | filter | ge, le, eq, ne, gt, lt | substringof, contains, startswith, endswith |</br>| displayName | filter | ge, le, eq, ne, gt, lt | substringof, contains, startswith, endswith |</br>| apiRevision | filter | ge, le, eq, ne, gt, lt | substringof, contains, startswith, endswith |</br>| path | filter | ge, le, eq, ne, gt, lt | substringof, contains, startswith, endswith |</br>| description | filter | ge, le, eq, ne, gt, lt | substringof, contains, startswith, endswith |</br>| serviceUrl | filter | ge, le, eq, ne, gt, lt | substringof, contains, startswith, endswith |</br>| isCurrent | filter | eq |     |</br>"
+          },
+          {
+            "$ref": "./apimanagement.json#/parameters/TopQueryParameter"
+          },
+          {
+            "$ref": "./apimanagement.json#/parameters/SkipQueryParameter"
+          },
+          {
+            "name": "includeNotTaggedApis",
+            "in": "query",
+            "required": false,
+            "type": "boolean",
+            "description": "Include not tagged APIs."
+          },
+          {
+            "$ref": "./apimanagement.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "./apimanagement.json#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Lists a collection of TagResource entities.",
+            "schema": {
+              "$ref": "./definitions.json#/definitions/TagResourceCollection"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "./apimanagement.json#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-pageable": {
+          "nextLinkName": "nextLink"
+        },
+        "x-ms-odata": "./definitions.json#/definitions/TagResourceContract"
+      }
+    }
+  },
+  "definitions": {},
+  "parameters": {}
+}