Managed Identity support in Azure Kusto output plugin (#1578)

* Update azure_kusto.md

Signed-off-by: Ravi Gupta <[email protected]>

* Apply suggestions from code review

Co-authored-by: Alexa Kreizinger <[email protected]>
Signed-off-by: Ravi Gupta <[email protected]>

---------

Signed-off-by: Ravi Gupta <[email protected]>
Co-authored-by: Alexa Kreizinger <[email protected]>

Author: dceravigupta

pipeline/outputs/azure_kusto.md

@@ -51,9 +51,10 @@ By default, Kusto will insert incoming ingestions into a table by inferring the
 
 | Key                         | Description                                                                                                                                                                                                                      | Default     |
 | --------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------- |
-| tenant_id                   | _Required_ - The tenant/domain ID of the AAD registered application.                                                                                                                                                             |             |
-| client_id                   | _Required_ - The client ID of the AAD registered application.                                                                                                                                                                    |             |
-| client_secret               | _Required_ - The client secret of the AAD registered application ([App Secret](https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal-portal#option-2-create-a-new-application-secret)). |
+| tenant_id                   | _Required if `managed_identity_client_id` is not set_ - The tenant/domain ID of the AAD registered application.                                                                                                                                                             |             |
+| client_id                   | _Required if `managed_identity_client_id` is not set_ - The client ID of the AAD registered application.                                                                                                                                                                    |             |
+| client_secret               | _Required if `managed_identity_client_id` is not set_ - The client secret of the AAD registered application ([App Secret](https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal-portal#option-2-create-a-new-application-secret)). |
+| managed_identity_client_id  | _Required if `tenant_id`, `client_id`, and `client_secret` are not set_ - The managed identity ID to authenticate with. Set to `SYSTEM` for system-assigned managed identity, or set to the MI client ID (GUID) for user-assigned managed identity.                                                                                                                                                                   |             |
 | ingestion_endpoint          | _Required_ - The cluster's ingestion endpoint, usually in the form `https://ingest-cluster_name.region.kusto.windows.net                                                                                                         |
 | database_name               | _Required_ - The database name.                                                                                                                                                                                                  |             |
 | table_name                  | _Required_ - The table name.                                                                                                                                                                                                     |             |