[ReleasePR mysql] Flexible MySQL: add APIs for AAD administrator (#2504)

Create to sync Azure/azure-rest-api-specs#19949
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/mysql?expand=1)

Author: msftbot[bot]

schemas/2021-12-01-preview/Microsoft.DBforMySQL.json

@@ -55,6 +55,9 @@
               },
               {
                 "$ref": "#/definitions/flexibleServers_firewallRules_childResource"
+              },
+              {
+                "$ref": "#/definitions/flexibleServers_administrators_childResource"
               }
             ]
           }
@@ -101,6 +104,53 @@
       ],
       "description": "Microsoft.DBforMySQL/flexibleServers"
     },
+    "flexibleServers_administrators": {
+      "type": "object",
+      "properties": {
+        "apiVersion": {
+          "type": "string",
+          "enum": [
+            "2021-12-01-preview"
+          ]
+        },
+        "name": {
+          "oneOf": [
+            {
+              "type": "string",
+              "pattern": "^.*/ActiveDirectory$"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "The name of the Azure AD Administrator."
+        },
+        "properties": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/AdministratorProperties"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "The properties of an administrator."
+        },
+        "type": {
+          "type": "string",
+          "enum": [
+            "Microsoft.DBforMySQL/flexibleServers/administrators"
+          ]
+        }
+      },
+      "required": [
+        "apiVersion",
+        "name",
+        "properties",
+        "type"
+      ],
+      "description": "Microsoft.DBforMySQL/flexibleServers/administrators"
+    },
     "flexibleServers_backups": {
       "type": "object",
       "properties": {
@@ -208,6 +258,42 @@
     }
   },
   "definitions": {
+    "AdministratorProperties": {
+      "type": "object",
+      "properties": {
+        "administratorType": {
+          "oneOf": [
+            {
+              "type": "string",
+              "enum": [
+                "ActiveDirectory"
+              ]
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Type of the sever administrator."
+        },
+        "identityResourceId": {
+          "type": "string",
+          "description": "The resource id of the identity used for AAD Authentication."
+        },
+        "login": {
+          "type": "string",
+          "description": "Login name of the server administrator."
+        },
+        "sid": {
+          "type": "string",
+          "description": "SID (object ID) of the server administrator."
+        },
+        "tenantId": {
+          "type": "string",
+          "description": "Tenant ID of the administrator."
+        }
+      },
+      "description": "The properties of an administrator."
+    },
     "Backup": {
       "type": "object",
       "properties": {
@@ -325,6 +411,48 @@
       ],
       "description": "The properties of a server firewall rule."
     },
+    "flexibleServers_administrators_childResource": {
+      "type": "object",
+      "properties": {
+        "apiVersion": {
+          "type": "string",
+          "enum": [
+            "2021-12-01-preview"
+          ]
+        },
+        "name": {
+          "type": "string",
+          "enum": [
+            "ActiveDirectory"
+          ],
+          "description": "The name of the Azure AD Administrator."
+        },
+        "properties": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/AdministratorProperties"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "The properties of an administrator."
+        },
+        "type": {
+          "type": "string",
+          "enum": [
+            "administrators"
+          ]
+        }
+      },
+      "required": [
+        "apiVersion",
+        "name",
+        "properties",
+        "type"
+      ],
+      "description": "Microsoft.DBforMySQL/flexibleServers/administrators"
+    },
     "flexibleServers_backups_childResource": {
       "type": "object",
       "properties": {

schemas/common/autogeneratedResources.json

@@ -6508,6 +6508,9 @@
         {
           "$ref": "https://schema.management.azure.com/schemas/2021-12-01-preview/Microsoft.DBforMySQL.json#/resourceDefinitions/flexibleServers"
         },
+        {
+          "$ref": "https://schema.management.azure.com/schemas/2021-12-01-preview/Microsoft.DBforMySQL.json#/resourceDefinitions/flexibleServers_administrators"
+        },
         {
           "$ref": "https://schema.management.azure.com/schemas/2021-12-01-preview/Microsoft.DBforMySQL.json#/resourceDefinitions/flexibleServers_backups"
         },