diff --git a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/CommonDefinitions.json b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/CommonDefinitions.json
index d17bced1bd51..f2bada32b6f3 100644
--- a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/CommonDefinitions.json
+++ b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/CommonDefinitions.json
@@ -1639,6 +1639,13 @@
             "name": "DataConnectorProvisioningState",
             "modelAsString": true
           }
+        },
+        "extendedProperties": {
+          "type": "object",
+          "description": "Additional properties for the data connector which can be used to store custom key-value pairs.",
+          "additionalProperties": {
+            "type": "object"
+          }
         }
       }
     }
diff --git a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentSpacesConnectors_CreateOrUpdate.json b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentSpacesConnectors_CreateOrUpdate.json
index 9e44cd3b0897..2bfc86526f5d 100644
--- a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentSpacesConnectors_CreateOrUpdate.json
+++ b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentSpacesConnectors_CreateOrUpdate.json
@@ -10,7 +10,15 @@
         "dataConnectorType": "CosmosDB",
         "dataSource": "https://newsharedcosmos.documents.azure.com:443/",
         "keyVaultUri": "https://testkv.vault.azure.net/secrets/new-shared-cosmos-connection-string",
-        "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sharedCosmosIdentity"
+        "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sharedCosmosIdentity",
+        "extendedProperties": {
+          "environment": "production",
+          "owner": "alice",
+          "additionalEndpoints": [
+            "https://foo.kusto.windows.net/databasename",
+            "https://bar.kusto.windows.net/databasename"
+          ]
+        }
       }
     }
   },
@@ -23,7 +31,15 @@
         "properties": {
           "dataConnectorType": "CosmosDB",
           "keyVaultUri": "https://testkv.vault.azure.net/secrets/new-shared-cosmos-connection-string",
-          "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sharedCosmosIdentity"
+          "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sharedCosmosIdentity",
+          "extendedProperties": {
+            "environment": "production",
+            "owner": "alice",
+            "additionalEndpoints": [
+              "https://foo.kusto.windows.net/databasename",
+              "https://bar.kusto.windows.net/databasename"
+            ]
+          }
         }
       }
     },
@@ -38,7 +54,15 @@
         "properties": {
           "dataConnectorType": "CosmosDB",
           "keyVaultUri": "https://testkv.vault.azure.net/secrets/new-shared-cosmos-connection-string",
-          "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sharedCosmosIdentity"
+          "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sharedCosmosIdentity",
+          "extendedProperties": {
+            "environment": "production",
+            "owner": "alice",
+            "additionalEndpoints": [
+              "https://foo.kusto.windows.net/databasename",
+              "https://bar.kusto.windows.net/databasename"
+            ]
+          }
         }
       }
     }
diff --git a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_CreateOrUpdate.json b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_CreateOrUpdate.json
index 5138bb3457f4..6e4c7e8a24d8 100644
--- a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_CreateOrUpdate.json
+++ b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_CreateOrUpdate.json
@@ -10,7 +10,14 @@
         "dataConnectorType": "SqlServer",
         "dataSource": "Server=newserver.database.windows.net;Database=NewDB;",
         "keyVaultUri": "https://testkv.vault.azure.net/secrets/new-sql-connection-string",
-        "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sqlIdentity"
+        "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sqlIdentity",
+        "extendedProperties": {
+          "AuthType": "Custom",
+          "CustomHeader": {
+            "DD_API_KEY": "value 1",
+            "DD_APPLICATION_KEY": "value 2"
+          }
+        }
       }
     }
   },
@@ -24,7 +31,14 @@
           "dataConnectorType": "SqlServer",
           "keyVaultUri": "https://testkv.vault.azure.net/secrets/new-sql-connection-string",
           "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sqlIdentity",
-          "source": "Agent"
+          "source": "Agent",
+          "extendedProperties": {
+            "AuthType": "Custom",
+            "CustomHeader": {
+              "DD_API_KEY": "value 1",
+              "DD_APPLICATION_KEY": "value 2"
+            }
+          }
         }
       }
     },
@@ -41,6 +55,13 @@
           "keyVaultUri": "https://testkv.vault.azure.net/secrets/new-sql-connection-string",
           "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sqlIdentity",
           "source": "Agent",
+          "extendedProperties": {
+            "AuthType": "Custom",
+            "CustomHeader": {
+              "DD_API_KEY": "value 1",
+              "DD_APPLICATION_KEY": "value 2"
+            }
+          },
           "provisioningState": "InProgress"
         }
       }
diff --git a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_Get.json b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_Get.json
index 2d2f483bed29..905b8a31a849 100644
--- a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_Get.json
+++ b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_Get.json
@@ -16,7 +16,14 @@
           "dataConnectorType": "SqlServer",
           "keyVaultUri": "https://testkv.vault.azure.net/secrets/sql-connection-string",
           "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sqlIdentity",
-          "source": "Agent"
+          "source": "Agent",
+          "extendedProperties": {
+            "AuthType": "Custom",
+            "CustomHeader": {
+              "DD_API_KEY": "value 1",
+              "DD_APPLICATION_KEY": "value 2"
+            }
+          }
         }
       }
     }
diff --git a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_ListByAgent.json b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_ListByAgent.json
index c0272c5e8b89..e9c58fe31d78 100644
--- a/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_ListByAgent.json
+++ b/specification/app/resource-manager/Microsoft.App/ContainerApps/stable/2026-01-01/examples/AgentsConnectors_ListByAgent.json
@@ -17,7 +17,14 @@
               "dataConnectorType": "SqlServer",
               "keyVaultUri": "https://testkv.vault.azure.net/secrets/sql-connection-string",
               "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/sqlIdentity",
-              "source": "Agent"
+              "source": "Agent",
+              "extendedProperties": {
+                "AuthType": "Custom",
+                "CustomHeader": {
+                  "DD_API_KEY": "value 1",
+                  "DD_APPLICATION_KEY": "value 2"
+                }
+              }
             }
           },
           {
@@ -27,7 +34,15 @@
             "properties": {
               "dataConnectorType": "AzureStorage",
               "identity": "/subscriptions/8efdecc5-919e-44eb-b179-915dca89ebf9/resourceGroups/examplerg/providers/Microsoft.ManagedIdentity/userAssignedIdentities/storageIdentity",
-              "source": "AgentSpace"
+              "source": "AgentSpace",
+              "extendedProperties": {
+                "environment": "production",
+                "owner": "alice",
+                "additionalEndpoints": [
+                  "https://foo.kusto.windows.net/databasename",
+                  "https://bar.kusto.windows.net/databasename"
+                ]
+              }
             }
           },
           {