Add x-ms-identifiers for datadog (#17744)

Author: yantang-msft

specification/datadog/resource-manager/Microsoft.Datadog/stable/2021-03-01/datadog.json

@@ -1242,7 +1242,10 @@
           "type": "array",
           "items": {
             "$ref": "#/definitions/DatadogApiKey"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         },
         "nextLink": {
           "description": "Link to the next set of results, if any.",
@@ -1326,7 +1329,10 @@
           "type": "array",
           "items": {
             "$ref": "#/definitions/DatadogHost"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         },
         "nextLink": {
           "description": "Link to the next set of results, if any.",
@@ -1452,7 +1458,10 @@
           "type": "array",
           "items": {
             "$ref": "#/definitions/OperationResult"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         },
         "nextLink": {
           "description": "URL to get the next set of operation list results if there are any.",
@@ -1824,7 +1833,10 @@
           "type": "array",
           "items": {
             "$ref": "#/definitions/FilteringTag"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         }
       }
     },
@@ -1837,7 +1849,10 @@
           "type": "array",
           "items": {
             "$ref": "#/definitions/FilteringTag"
-          }
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
         }
       }
     },